Ratio - Input:Output is 1:21 - Clock/Timing - Clock Buffers, Drivers Distributor - 851021AYLF NB4N121KMNG NB4N121KMNR2G

Part Number	Manufacturer / Brand	Brife Description	Part Status	Type	Number of Circuits	Ratio - Input:Output	Differential - Input:Output	Input	Output	Frequency - Max	Voltage - Supply	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package
851021AYLF	IDT, Integrated Device Technology Inc	IC CLOCK BUFFER 121 250MHZ 64TQFP	Obsolete	Fanout Buffer (Distribution)	1	1:21	Yes/Yes	HCSL, LVDS, LVHSTL, LVPECL	HCSL	250MHz	3.135 V ~ 3.465 V	0°C ~ 70°C	Surface Mount	64-TQFP Exposed Pad	64-TQFP-EP (10x10)
NB4N121KMNG	ON Semiconductor	IC CLOCK BUFFER 121 400MHZ 52QFN	Active	Fanout Buffer (Distribution)	1	1:21	Yes/Yes	CML, LVCMOS, LVDS, LVPECL, LVTTL	HCSL	400MHz	3 V ~ 3.6 V	-40°C ~ 70°C	Surface Mount	52-VFQFN Exposed Pad	52-QFN (8x8)
NB4N121KMNR2G	ON Semiconductor	IC CLOCK BUFFER 121 400MHZ 52QFN	Active	Fanout Buffer (Distribution)	1	1:21	Yes/Yes	CML, LVCMOS, LVDS, LVPECL, LVTTL	HCSL	400MHz	3 V ~ 3.6 V	-40°C ~ 70°C	Surface Mount	52-VFQFN Exposed Pad	52-QFN (8x8)