VRAM
Austin Semiconductor, Inc.
262144 x 16 BIT VRAM
MULTIPORT VIDEO RAM
AVAILABLE AS MILITARY
SPECIFICATIONS
• Military Processing Flow(SM Level)
• -55C to 125C temperature
(Top View)
64-Pin Ceramic Flatpack (HKC)
SM55161A
Production
PIN ASSIGNMENT
FEATURES
• Organization:
– DRAM: 262 144 by 16 Bits
– SAM: 512 by 16 Bits
• Dual-Port Accessibility – Simultaneous and Asynchronous
Access From the DRAM and SAM Ports
• Bidirectional Data-Transfer Function From the DRAM to
the Serial-Data Register, and from Serial Data Register to DRAM
• (8 x 8) x 2 Block Write feature for fast area fill
• Write-Per-Bit Feature for Selective Write to Each RAM I/O; Two
Write-Per-Bit Modes to Simplify System Design
• Byte-Write Control (CASL, CASU) Provides Flexibility
• Extended Data Output for Faster System Cycle Time
• Enhanced Page-Mode Operation for Faster Access
• CAS-Before-RAS (CBR) and Hidden-Refresh Modes
• Long Refresh Period: Every 8 ms (Maximum)
• Up to 50-MHz Uninterrupted Serial-Data Streams
• 512 Selectable Serial-Register Starting Locations
• SE-Controlled Register-Status QSF
• Split-Register-Transfer Read for Simplified Real-Time Register
Load
• Programmable Split-Register Stop Point
• 3-State Serial Outputs Allow Easy Multiplexing of Video-Data
Streams
• Pin-out Compatible upgrade from SM55161
• Compatible With JEDEC Standards
PIN DESCRIPTIONS
PIN
A0-A8
CASL\, CASU\
DQ0-DQ15
DSF
NC/GND
DESCRIPTION
Address inputs
Column-Address Strobe/Byte Selects
DRAM Data I/O, Write Mask Data
Special Function Select
Special-Function Select
No Connect/Ground (NOTE: Not
connected internally to V
SS
)
Special-Function Output
Row-Address Strobe
Serial Clock
Serial Enable
Serial-Data Output
Output Enable, Transfer Select
5V Supply (TYP)
Ground
DRAM Write-Enable Select
OPTIONS
• Timing
70ns access
75ns access
80ns access
• Package
68 pin PGA
64 pin Flatpack
• Operating Temperature Ranges
- Military (-55
o
C to +125
o
C)
- Industrial (-40
o
C to +85
o
C)
MARKING
-70
-75
-80
QSF
RAS\
SC
SE\
SQ0-SQ15
TRG\
V
CC
GB
HKC
V
SS
WE\
M suffix
I suffix
For more products and information
please visit our web site at
www.austinsemiconductor.com
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
SMJ55161A
Rev. 1.6 03/05
1
AUSTIN [ AUSTIN SEMICONDUCTOR ]
