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74VCX16839 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. 74VCX16839
Description  Low Voltage 20-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs and Outputs
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74VCX16839 Datasheet(HTML) 1 Page - Fairchild Semiconductor

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© 2000 Fairchild Semiconductor Corporation
DS500105
www.fairchildsemi.com
July 1997
Revised November 2000
74VCX16839
Low Voltage 20-Bit Selectable Register/Buffer
with 3.6V Tolerant Inputs and Outputs
General Description
The VCX16839 contains twenty non-inverting selectable
buffered or registered paths. The device can be configured
to operate in a registered, or flow through buffer mode by
utilizing the register enable (REGE) and Clock (CLK) sig-
nals. The device operates in a 20-bit word wide mode. All
outputs can be placed into 3-STATE through use of the OE
pin. These devices are ideally suited for buffered or regis-
tered 168 pin and 200 pin SDRAM DIMM memory mod-
ules.
The 74VCX16839 is designed for low voltage (1.65V to
3.6V) VCC applications with I/O compatibility up to 3.6V.
The 74VCX16839 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s Compatible with PC100 and PC133 DIMM module
specifications
s 1.65V–3.6V VCC supply operation
s 3.6V tolerant inputs and outputs
s tPD (CLK to On)
3.2 ns max for 3.0V to 3.6V VCC
4.4 ns max for 2.3V to 2.7V VCC
8.8 ns max for 1.65V to 1.95V VCC
s Power-off high impedance inputs and outputs
s Supports live insertion and withdrawal (Note 1)
s Static Drive (IOH/IOL)
±24 mA @ 3.0V V
CC
±18 mA @ 2.3V V
CC
±6 mA @ 1.65V V
CC
s Uses patented noise/EMI reduction circuitry
s Latch-up performance exceeds 300 mA
s ESD performance:
Human body model
> 2000V
Machine model
> 200V
Note 1: To ensure the high-impedance state during power up or power
down, OE should be tied to VCC through a pull-up resistor; the minimum
value of the resistor is determined by the current-sourcing capability of the
driver.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Order Number
Package Number
Package Descriptions
74VCX16839MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Names
Description
OE
Output Enable Input (Active LOW)
I0–I19
Inputs
O0–O19
Outputs
CLK
Clock Input
REGE
Register Enable Input


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