74ALVC16839 Datasheet, PDF (1/6 Pages) Fairchild Semiconductor – Low Voltage 20-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs and Outputs

December 2001
Revised December 2001
74ALVC16839
Low Voltage 20-Bit Selectable Register/Buffer
with 3.6V Tolerant Inputs and Outputs
General Description
The ALVC16839 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 74ALVC16839 is designed for low voltage (1.65V to
3.6V) V_CC applications with I/O compatibility up to 3.6V.
The 74ALVC16839 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 to 3.6V V_CC supply operation
s 3.6V tolerant inputs and outputs
s t_PD (CLK to O_n)
3.7 ns max for 3.0V to 3.6V V_CC
4.9 ns max for 2.3V to 2.7V V_CC
8.8 ns max for 1.65V to 1.95V V_CC
s Power-off high impedance inputs and outputs
s Supports live insertion and withdrawal (Note 1)
s Uses patented noise/EMI reduction circuitry
s Latchup conforms to JEDEC JED78
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 V_CC through a pull-up resistor; the minimum
value of the resistor is determined by the current-sourcing capability of the
driver.
Ordering Code:
Order Number Package Number
Package Descriptions
74ALVC16839MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
Description
OE
I₀–I₁₉
O₀–O₁₉
CLK
REGE
Output Enable Input (Active LOW)
Inputs
Outputs
Clock Input
Register Enable Input
© 2001 Fairchild Semiconductor Corporation DS500713
www.fairchildsemi.com