SN74ALVCH16836
20-BIT UNIVERSAL BUS DRIVER
WITH 3-STATE OUTPUTS
SCES089C – OCTOBER 1996 – REVISED FEBRUARY 1999
DGG OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
OE
Y1
Y2
GND
Y3
Y4
1
2
3
4
5
6
7
8
9
10
56 CLK
55 A1
54 A2
53 GND
52 A3
51 A4
Designed to Comply With JEDEC 168-Pin
and 200-Pin SDRAM Buffered DIMM
Specification
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
V
50
V
CC
Y5
CC
49 A5
48 A6
Package Options Include Plastic Shrink
Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages
Y6
Y7
GND 11
Y8 12
47
A7
46 GND
45 A8
description
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
Y9
Y10
Y11
Y12
Y13
GND
Y14
Y15
Y16
A9
A10
A11
A12
A13
GND
A14
A15
A16
This 20-bit universal bus driver is designed for
1.65-V to 3.6-V V operation.
CC
Data flow from A to Y is controlled by the
output-enable (OE) input. The device operates in
the transparent mode when the latch-enable (LE)
inputislow. TheAdataislatchediftheclock(CLK)
input is held at a high or low logic level. If LE is
high, the A data is stored in the latch/flip-flop on
the low-to-high transition of CLK. When OE is
high, the outputs are in the high-impedance state.
V
V
CC
CC
Y17
Y18
GND
Y19
Y20
NC
A17
A18
GND
A19
A20
LE
To ensure the high-impedance state during power
up or power down, OE should be tied to V
through a pullup resistor; the minimum value of
the resistor is determined by the current-sinking
capability of the driver.
CC
NC – No internal connection
Active bus-hold circuitry is provided to hold
unused or floating data inputs at a valid logic level.
The SN74ALVCH16836 is characterized for
operation from –40°C to 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
Copyright 1999, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265