|
|
Clock Buffer Dual bank 4-channel output LVDS 1.8V 2.
- LMK1D2104LRHDT
- Texas Instruments
-
1:
$14.99
-
104In Stock
-
New Product
|
Mouser Part No
595-LMK1D2104LRHDT
New Product
|
Texas Instruments
|
Clock Buffer Dual bank 4-channel output LVDS 1.8V 2.
|
|
104In Stock
|
|
|
$14.99
|
|
|
$11.73
|
|
|
$10.92
|
|
|
$10.92
|
|
Min.: 1
Mult.: 1
Max.: 25
:
250
|
|
|
8 Output
|
|
0.575 ns
|
|
VQFN-28
|
|
2 GHz
|
1.71 V
|
3.46 V
|
LMK1D2104L
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer 4-output LP-HCSL clo ck buffer for PCIe
- LMKDB1104Z85REXT
- Texas Instruments
-
1:
$4.43
-
269In Stock
-
New Product
|
Mouser Part No
595-LMKDB1104Z85REXT
New Product
|
Texas Instruments
|
Clock Buffer 4-output LP-HCSL clo ck buffer for PCIe
|
|
269In Stock
|
|
|
$4.43
|
|
|
$3.36
|
|
|
$3.08
|
|
|
$2.79
|
|
|
$2.79
|
|
Min.: 1
Mult.: 1
Max.: 100
:
250
|
|
|
4 Output
|
400 MHz
|
|
LP-HCSL
|
VQFN-28
|
LP-HCSL
|
400 MHz
|
1.71 V
|
3.6 V
|
LMKDB1104
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer 8-output clock buffe r for PCIe® Gen
- CDCDB803ERSLR
- Texas Instruments
-
1:
$5.09
-
3,990In Stock
|
Mouser Part No
595-CDCDB803ERSLR
|
Texas Instruments
|
Clock Buffer 8-output clock buffe r for PCIe® Gen
|
|
3,990In Stock
|
|
|
$5.09
|
|
|
$3.84
|
|
|
$3.52
|
|
|
$3.17
|
|
|
View
|
|
|
$2.76
|
|
|
$3.02
|
|
|
$3.00
|
|
|
$2.81
|
|
|
$2.76
|
|
|
$2.76
|
|
Min.: 1
Mult.: 1
:
4,000
|
|
|
8 Output
|
250 MHz
|
3 ns
|
|
VQFN-48
|
Differential
|
250 MHz
|
3 V
|
3.6 V
|
CDCDB803
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer DB2000QL-compliant 2 0-output clock buff
- LMKDB1120Z100NPPR
- Texas Instruments
-
1:
$7.05
-
3,082In Stock
|
Mouser Part No
595-LMKDB1120Z100NPR
|
Texas Instruments
|
Clock Buffer DB2000QL-compliant 2 0-output clock buff
|
|
3,082In Stock
|
|
|
$7.05
|
|
|
$5.42
|
|
|
$5.01
|
|
|
$4.56
|
|
|
View
|
|
|
$4.36
|
|
|
$4.29
|
|
|
$4.26
|
|
|
$4.16
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
|
|
|
20 Output
|
400 MHz
|
1 ns
|
LP-HCSL
|
TLGA-80
|
LP-HCSL
|
400 MHz
|
1.71 V
|
3.6 V
|
LMKDB1120
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer DB2000QL-compliant 2 0-output clock buff
- LMKDB1120Z85NPPR
- Texas Instruments
-
1:
$6.43
-
515In Stock
|
Mouser Part No
595-LMKDB1120Z85NPPR
|
Texas Instruments
|
Clock Buffer DB2000QL-compliant 2 0-output clock buff
|
|
515In Stock
|
|
|
$6.43
|
|
|
$4.94
|
|
|
$4.56
|
|
|
$4.15
|
|
|
View
|
|
|
$3.97
|
|
|
$3.90
|
|
|
$3.87
|
|
|
$3.69
|
|
Min.: 1
Mult.: 1
|
|
|
20 Output
|
400 MHz
|
1 ns
|
LP-HCSL
|
TLGA-80
|
LP-HCSL
|
400 MHz
|
1.71 V
|
3.6 V
|
LMKDB1120
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer Lo Jitter 1:3 LVCMOS Fan-out Clock Bfr A A 595-CDCLVC1103PW
- CDCLVC1103PWR
- Texas Instruments
-
1:
$3.50
-
23,417In Stock
|
Mouser Part No
595-CDCLVC1103PWR
|
Texas Instruments
|
Clock Buffer Lo Jitter 1:3 LVCMOS Fan-out Clock Bfr A A 595-CDCLVC1103PW
|
|
23,417In Stock
|
|
|
$3.50
|
|
|
$2.65
|
|
|
$2.44
|
|
|
$2.19
|
|
|
$2.00
|
|
|
View
|
|
|
$2.16
|
|
|
$2.11
|
|
|
$1.97
|
|
Min.: 1
Mult.: 1
:
2,000
|
|
|
3 Output
|
250 MHz
|
2 ns
|
LVCMOS
|
TSSOP-8
|
LVCMOS
|
250 MHz
|
2.3 V
|
3.6 V
|
CDCLVC1103
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer 1:10 LVPECL Buffer w / Selectable Input
- CDCLVP111MVFREP
- Texas Instruments
-
1:
$183.73
-
192In Stock
|
Mouser Part No
595-CDCLVP111MVFREP
|
Texas Instruments
|
Clock Buffer 1:10 LVPECL Buffer w / Selectable Input
|
|
192In Stock
|
|
|
$183.73
|
|
|
$160.48
|
|
|
$157.11
|
|
|
$157.11
|
|
Min.: 1
Mult.: 1
:
1,000
|
|
|
10 Output
|
3.5 GHz
|
355 ps
|
LVPECL
|
LQFP-32
|
CML, LVDS, LVPECL, SSTL
|
3.5 GHz
|
2.375 V
|
3.8 V
|
CDCLVP111
|
- 55 C
|
+ 125 C
|
|
|
|
Clock Buffer EP Gen Purp & PCI-X 1:4 Clock Buffer
- CDCV304TPWREP
- Texas Instruments
-
1:
$11.35
-
3,221In Stock
|
Mouser Part No
595-CDCV304TPWREP
|
Texas Instruments
|
Clock Buffer EP Gen Purp & PCI-X 1:4 Clock Buffer
|
|
3,221In Stock
|
|
|
$11.35
|
|
|
$8.87
|
|
|
$8.26
|
|
|
$7.57
|
|
|
View
|
|
|
$6.95
|
|
|
$7.29
|
|
|
$7.21
|
|
|
$7.12
|
|
|
$6.95
|
|
Min.: 1
Mult.: 1
:
2,000
|
|
|
4 Output
|
200 MHz
|
4.5 ns
|
LVTTL
|
TSSOP-8
|
LVTTL
|
200 MHz
|
2.3 V
|
3.6 V
|
CDCV304
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer 4-channel output LVC MOS 1.8-V buffer 8- LMK1C1104DQFT
- LMK1C1104DQFR
- Texas Instruments
-
1:
$3.34
-
8,257In Stock
-
15,000Expected 2026/11/16
|
Mouser Part No
595-LMK1C1104DQFR
|
Texas Instruments
|
Clock Buffer 4-channel output LVC MOS 1.8-V buffer 8- LMK1C1104DQFT
|
|
8,257In Stock
15,000Expected 2026/11/16
|
|
|
$3.34
|
|
|
$2.49
|
|
|
$2.28
|
|
|
$2.04
|
|
|
$1.74
|
|
|
View
|
|
|
$1.93
|
|
|
$1.90
|
|
|
$1.79
|
|
|
$1.70
|
|
Min.: 1
Mult.: 1
:
3,000
|
|
|
4 Output
|
250 MHz
|
2 ns
|
|
WSON-8
|
LVCMOS
|
250 MHz
|
1.71 V
|
3.465 V
|
LMK1C1104
|
- 40 C
|
+ 125 C
|
|
|
|
Clock Buffer Dual bank 2-channel output LVDS 1.8-V 2 LMK1D2102RGTT
- LMK1D2102RGTR
- Texas Instruments
-
1:
$9.51
-
3,847In Stock
|
Mouser Part No
595-LMK1D2102RGTR
|
Texas Instruments
|
Clock Buffer Dual bank 2-channel output LVDS 1.8-V 2 LMK1D2102RGTT
|
|
3,847In Stock
|
|
|
$9.51
|
|
|
$7.40
|
|
|
$6.87
|
|
|
$6.29
|
|
|
View
|
|
|
$5.78
|
|
|
$6.07
|
|
|
$6.00
|
|
|
$5.92
|
|
|
$5.78
|
|
Min.: 1
Mult.: 1
:
3,000
|
|
|
8 Output
|
|
575 ps
|
Differential
|
VQFN-16
|
3-State
|
250 MHz
|
1.71 V
|
3.465 V
|
LMK1D2102
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer Automotive 1.5-V to 3.3-V 1-to-4 high- A A 595-MK00804BQWRGTTQ1
- LMK00804BQWRGTRQ1
- Texas Instruments
-
1:
$8.55
-
2,928In Stock
|
Mouser Part No
595-MK00804BQWRGTRQ1
|
Texas Instruments
|
Clock Buffer Automotive 1.5-V to 3.3-V 1-to-4 high- A A 595-MK00804BQWRGTTQ1
|
|
2,928In Stock
|
|
|
$8.55
|
|
|
$6.62
|
|
|
$6.14
|
|
|
$5.62
|
|
|
View
|
|
|
$5.09
|
|
|
$5.40
|
|
|
$5.33
|
|
|
$5.26
|
|
|
$5.09
|
|
Min.: 1
Mult.: 1
:
3,000
|
|
|
4 Output
|
350 MHz
|
2.5 ns
|
LVCMOS
|
VQFN-16
|
HCSL, LVCMOS, LVDS, LVPECL, LVTTL
|
|
3.135 V
|
3.465 V
|
LMK00804B
|
- 40 C
|
+ 125 C
|
|
|
|
Clock Buffer DB2000QL-compliant 2 0-output clock buff
- LMKDB1120Z85NPPT
- Texas Instruments
-
1:
$8.46
-
250In Stock
|
Mouser Part No
595-LMKDB1120Z85NPPT
|
Texas Instruments
|
Clock Buffer DB2000QL-compliant 2 0-output clock buff
|
|
250In Stock
|
|
|
$8.46
|
|
|
$6.52
|
|
|
$6.04
|
|
|
$5.50
|
|
|
View
|
|
|
$5.09
|
|
|
$4.93
|
|
|
$4.70
|
|
Min.: 1
Mult.: 1
|
|
|
20 Output
|
400 MHz
|
1 ns
|
LP-HCSL
|
TLGA-80
|
LP-HCSL
|
400 MHz
|
1.71 V
|
3.6 V
|
LMKDB1120
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer 8-output clock buffe r for PCIe® Gen CDCDB800RSLT
- CDCDB800RSLR
- Texas Instruments
-
1:
$4.43
-
2,511In Stock
|
Mouser Part No
595-CDCDB800RSLR
|
Texas Instruments
|
Clock Buffer 8-output clock buffe r for PCIe® Gen CDCDB800RSLT
|
|
2,511In Stock
|
|
|
$4.43
|
|
|
$3.35
|
|
|
$3.08
|
|
|
$2.79
|
|
|
View
|
|
|
$2.24
|
|
|
$2.67
|
|
|
$2.59
|
|
|
$2.56
|
|
|
$2.24
|
|
Min.: 1
Mult.: 1
:
4,000
|
|
|
8 Output
|
250 MHz
|
3 ns
|
LP-HCSL
|
VQFN-48
|
LP-HCSL
|
250 MHz
|
3 V
|
3.6 V
|
CDCDB800
|
- 40 C
|
+ 105 C
|
|
|
|
Clock Buffer Lo Jitter 1:8 LVCMOS Fan-out Clock Bfr A A 595-CDCLVC1108PW
- CDCLVC1108PWR
- Texas Instruments
-
1:
$5.47
-
507In Stock
-
2,000Expected 2026/08/24
|
Mouser Part No
595-CDCLVC1108PWR
|
Texas Instruments
|
Clock Buffer Lo Jitter 1:8 LVCMOS Fan-out Clock Bfr A A 595-CDCLVC1108PW
|
|
507In Stock
2,000Expected 2026/08/24
|
|
|
$5.47
|
|
|
$4.16
|
|
|
$3.84
|
|
|
$3.48
|
|
|
View
|
|
|
$3.09
|
|
|
$3.31
|
|
|
$3.26
|
|
|
$3.21
|
|
|
$3.09
|
|
Min.: 1
Mult.: 1
:
2,000
|
|
|
8 Output
|
250 MHz
|
2 ns
|
LVCMOS
|
TSSOP-16
|
LVCMOS
|
250 MHz
|
2.3 V
|
3.6 V
|
CDCLVC1108
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Lo Jttr 1:10 LVCMOS Fan-out Clock Bfr A A 595-CDCLVC1110PW
- CDCLVC1110PWR
- Texas Instruments
-
1:
$6.19
-
2,128In Stock
|
Mouser Part No
595-CDCLVC1110PWR
|
Texas Instruments
|
Clock Buffer Lo Jttr 1:10 LVCMOS Fan-out Clock Bfr A A 595-CDCLVC1110PW
|
|
2,128In Stock
|
|
|
$6.19
|
|
|
$4.75
|
|
|
$4.38
|
|
|
$3.99
|
|
|
View
|
|
|
$3.59
|
|
|
$3.80
|
|
|
$3.68
|
|
|
$3.64
|
|
|
$3.59
|
|
Min.: 1
Mult.: 1
:
2,000
|
|
|
10 Output
|
250 MHz
|
2 ns
|
LVCMOS
|
TSSOP-20
|
LVCMOS
|
250 MHz
|
2.3 V
|
3.6 V
|
CDCLVC1110
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Low Jitter 1:12 LVC MOS Fan-out Clck Bfr A 595-CDCLVC1112PW
- CDCLVC1112PWR
- Texas Instruments
-
1:
$7.70
-
3,088In Stock
|
Mouser Part No
595-CDCLVC1112PWR
|
Texas Instruments
|
Clock Buffer Low Jitter 1:12 LVC MOS Fan-out Clck Bfr A 595-CDCLVC1112PW
|
|
3,088In Stock
|
|
|
$7.70
|
|
|
$5.94
|
|
|
$5.50
|
|
|
$5.02
|
|
|
View
|
|
|
$4.35
|
|
|
$4.73
|
|
|
$4.62
|
|
|
$4.35
|
|
Min.: 1
Mult.: 1
:
2,000
|
|
|
12 Output
|
250 MHz
|
2 ns
|
LVCMOS
|
TSSOP-24
|
LVCMOS
|
250 MHz
|
2.3 V
|
3.6 V
|
CDCLVC1112
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer 1-to-10 LVDS Clock B uffer A 595-CDCLVD1 A 595-CDCLVD110ARHBR
- CDCLVD110ARHBT
- Texas Instruments
-
1:
$18.43
-
257In Stock
|
Mouser Part No
595-CDCLVD110ARHBT
|
Texas Instruments
|
Clock Buffer 1-to-10 LVDS Clock B uffer A 595-CDCLVD1 A 595-CDCLVD110ARHBR
|
|
257In Stock
|
|
|
$18.43
|
|
|
$14.61
|
|
|
$13.65
|
|
|
$12.62
|
|
|
$12.00
|
|
|
View
|
|
|
$11.73
|
|
|
$11.72
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
:
250
|
|
|
10 Output
|
1.1 GHz
|
3 ns
|
LVDS
|
VQFN-32
|
LVDS
|
1.1 GHz
|
2.375 V
|
2.625 V
|
CDCLVD110A
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer 1:10 Clock Buffer A 595-CDCLVD110AVFR A A 595-CDCLVD110AVFR
- CDCLVD110AVF
- Texas Instruments
-
1:
$18.43
-
132In Stock
|
Mouser Part No
595-CDCLVD110AVF
|
Texas Instruments
|
Clock Buffer 1:10 Clock Buffer A 595-CDCLVD110AVFR A A 595-CDCLVD110AVFR
|
|
132In Stock
|
|
|
$18.43
|
|
|
$14.61
|
|
|
$13.65
|
|
|
$13.13
|
|
|
$11.15
|
|
Min.: 1
Mult.: 1
|
|
|
10 Output
|
1.1 GHz
|
3 ns
|
LVDS
|
LQFP-32
|
LVDS
|
1.1 GHz
|
2.375 V
|
2.625 V
|
CDCLVD110A
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Lo Jitter 2-In Sel 1 :4 Univ-to-LVDS Bfr A 595-CDCLVD1204RGTR
- CDCLVD1204RGTT
- Texas Instruments
-
1:
$9.97
-
366In Stock
|
Mouser Part No
595-CDCLVD1204RGTT
|
Texas Instruments
|
Clock Buffer Lo Jitter 2-In Sel 1 :4 Univ-to-LVDS Bfr A 595-CDCLVD1204RGTR
|
|
366In Stock
|
|
|
$9.97
|
|
|
$7.76
|
|
|
$7.20
|
|
|
$6.61
|
|
|
$6.27
|
|
|
View
|
|
|
$6.06
|
|
|
$5.97
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
:
250
|
|
|
4 Output
|
800 MHz
|
2.5 ns
|
LVDS
|
VQFN-16
|
LVCMOS, LVDS, LVPECL
|
800 MHz
|
2.375 V
|
2.625 V
|
CDCLVD1204
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Low Jitter2-Inp Sel 1:8 Univ-to-LVDS Bfr A 595-CDCLVD1208RHDR
- CDCLVD1208RHDT
- Texas Instruments
-
1:
$13.78
-
657In Stock
|
Mouser Part No
595-CDCLVD1208RHDT
|
Texas Instruments
|
Clock Buffer Low Jitter2-Inp Sel 1:8 Univ-to-LVDS Bfr A 595-CDCLVD1208RHDR
|
|
657In Stock
|
|
|
$13.78
|
|
|
$10.86
|
|
|
$10.12
|
|
|
$9.32
|
|
|
$9.19
|
|
|
View
|
|
|
$8.76
|
|
|
$8.51
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
:
250
|
|
|
8 Output
|
800 MHz
|
2.5 ns
|
LVDS
|
VQFN-28
|
LVCMOS, LVDS, LVPECL
|
800 MHz
|
2.375 V
|
2.625 V
|
CDCLVD1208
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Low Jitter 1:4 Univ- to-LVDS Buffer A 59 A 595-CDCLVD1213RGTT
- CDCLVD1213RGTR
- Texas Instruments
-
1:
$12.07
-
1,587In Stock
|
Mouser Part No
595-CDCLVD1213RGTR
|
Texas Instruments
|
Clock Buffer Low Jitter 1:4 Univ- to-LVDS Buffer A 59 A 595-CDCLVD1213RGTT
|
|
1,587In Stock
|
|
|
$12.07
|
|
|
$9.47
|
|
|
$8.82
|
|
|
$8.09
|
|
|
$7.94
|
|
|
$6.92
|
|
Min.: 1
Mult.: 1
:
3,000
|
|
|
4 Output
|
800 MHz
|
|
LVDS
|
VQFN-16
|
LVCMOS, LVDS, LVPECL
|
800 MHz
|
|
|
CDCLVD1213
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Low Jitter 1:4 Univ- to-LVDS Buffer A 59 A 595-CDCLVD1213RGTR
- CDCLVD1213RGTT
- Texas Instruments
-
1:
$13.97
-
335In Stock
|
Mouser Part No
595-CDCLVD1213RGTT
|
Texas Instruments
|
Clock Buffer Low Jitter 1:4 Univ- to-LVDS Buffer A 59 A 595-CDCLVD1213RGTR
|
|
335In Stock
|
|
|
$13.97
|
|
|
$11.00
|
|
|
$10.26
|
|
|
$9.44
|
|
|
$9.05
|
|
|
View
|
|
|
$8.70
|
|
|
$8.63
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
:
250
|
|
|
4 Output
|
800 MHz
|
2.5 ns
|
LVDS
|
VQFN-16
|
LVCMOS, LVDS, LVPECL
|
800 MHz
|
2.375 V
|
2.625 V
|
CDCLVD1213
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Lo Jitter Dual 1:2 U niv-to-LVDS Buffer A 595-CDCLVD2102RGTT
- CDCLVD2102RGTR
- Texas Instruments
-
1:
$7.75
-
2,130In Stock
|
Mouser Part No
595-CDCLVD2102RGTR
|
Texas Instruments
|
Clock Buffer Lo Jitter Dual 1:2 U niv-to-LVDS Buffer A 595-CDCLVD2102RGTT
|
|
2,130In Stock
|
|
|
$7.75
|
|
|
$5.97
|
|
|
$5.54
|
|
|
$5.05
|
|
|
View
|
|
|
$4.35
|
|
|
$4.76
|
|
|
$4.68
|
|
|
$4.35
|
|
Min.: 1
Mult.: 1
:
3,000
|
|
|
4 Output
|
800 MHz
|
|
LVDS
|
VQFN-16
|
LVCMOS, LVDS, LVPECL
|
800 MHz
|
|
|
CDCLVD2102
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Low Jitter Dual 1:8 Uni-to-LVDS Bfr A 59 A 595-CDCLVD2108RGZR
- CDCLVD2108RGZT
- Texas Instruments
-
1:
$18.74
-
546In Stock
|
Mouser Part No
595-CDCLVD2108RGZT
|
Texas Instruments
|
Clock Buffer Low Jitter Dual 1:8 Uni-to-LVDS Bfr A 59 A 595-CDCLVD2108RGZR
|
|
546In Stock
|
|
|
$18.74
|
|
|
$14.87
|
|
|
$13.91
|
|
|
$12.85
|
|
|
$12.64
|
|
|
View
|
|
|
$12.18
|
|
|
$11.93
|
|
Min.: 1
Mult.: 1
:
250
|
|
|
16 Output
|
800 MHz
|
2.5 ns
|
LVDS
|
VQFN-48
|
LVCMOS, LVDS, LVPECL
|
800 MHz
|
2.375 V
|
2.625 V
|
CDCLVD2108
|
- 40 C
|
+ 85 C
|
|
|
|
Clock Buffer Lo Jtr 16 Out LVPECL Buffer w/ Sel Inp A A 595-CDCLVP1216RGZR
- CDCLVP1216RGZT
- Texas Instruments
-
1:
$27.75
-
250In Stock
|
Mouser Part No
595-CDCLVP1216RGZT
|
Texas Instruments
|
Clock Buffer Lo Jtr 16 Out LVPECL Buffer w/ Sel Inp A A 595-CDCLVP1216RGZR
|
|
250In Stock
|
|
|
$27.75
|
|
|
$22.34
|
|
|
$21.00
|
|
|
$19.62
|
|
|
$18.77
|
|
|
View
|
|
|
$18.34
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
:
250
|
|
|
16 Output
|
2 GHz
|
550 ps
|
LVPECL
|
VQFN-48
|
LVCMOS, LVDS, LVPECL
|
2 GHz
|
2.375 V
|
3.6 V
|
CDCLVP1216
|
- 40 C
|
+ 85 C
|
|
South Africa