AS7C33512NTD16A
AS7C33512NTD18A
®
Signal descriptions
Signal
CLK
I/O Properties
Description
I
CLOCK Clock. All inputs except OE, FT, LBO, and ZZ are synchronous to this clock.
CEN
I
I
SYNC
SYNC
SYNC
Clock enable. When de-asserted HIGH, the clock input signal is masked.
Address. Sampled when all chip enables are active and ADV/LD is asserted.
Data. Driven as output when the chip is enabled and OE is active.
A, A0, A1
DQ[a,b]
I/O
CE0, CE1,
CE2
Synchronous chip enables. Sampled at the rising edge of CLK, when ADV/LD is asserted. Are
ignored when ADV/LD is HIGH.
I
I
I
SYNC
Advance or Load. When sampled HIGH, the internal burst address counter will increment in
the order defined by the LBO input value. (refer to table on page 2) When LOW, a new
address is loaded.
ADV/LD
R/W
SYNC
A HIGH during LOAD initiates a READ operation. A LOW during LOAD initiates a WRITE
operation. Is ignored when ADV/LD is HIGH.
SYNC
SYNC
Byte write enables. Used to control write on individual bytes. Sampled along with WRITE
command and BURST WRITE.
BW[a,b]
OE
I
I
ASYNC Asynchronous output enable. I/O pins are not driven when OE is inactive.
Count mode. When driven High, count sequence follows Intel XOR convention. When
STATIC driven Low, count sequence follows linear convention. This input should be static when the
device is in operation.
LBO
I
Flow-through mode.When low, enables single register flow-through mode. Connect to VDD
if unused or for pipelined operation.
FT
I
STATIC
ZZ
I
ASYNC Snooze. Places device in low power mode; data is retained. Connect to VSS if unused.
NC
-
-
No connects. Note that pin 84 will be used for future address expansion to 18Mb density.
Absolute maximum ratings
Parameter
Symbol
VDD, VDDQ
VIN
Min
–0.5
–0.5
–0.5
–
Max
+4.6
Unit
V
Power supply voltage relative to GND
Input voltage relative to GND (input pins)
Input voltage relative to GND (I/O pins)
Power dissipation
VDD + 0.5
VDDQ + 0.5
1.8
V
VIN
V
PD
W
mA
°C
°C
DC output current
IOUT
–
50
Storage temperature (plastic)
Temperature under bias
Tstg
–65
–65
+150
Tbias
+135
Note: Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional oper-
ation of the device at these or any other conditions outside those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions may affect reliability.
3/11/02; v.1.8H
Alliance Semiconductor
4 of 12
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
