UL6264A
Low Voltage 8K x 8 SRAM
Packages: PDIP28(600 mil)
SOP28 (330 mil)
change, the data outputs go High-Z
until the new read information is
available. The data outputs have no
preferred state. If the memory is
driven by CMOS levels in the active
state, and if there is no change of
the address, data input and control
signals W or G, the operating cur-
rent (at IO = 0 mA) drops to the
value of the operating current in the
Standby mode. The Read cycle is
finished by the falling edge of E2 or
W, or by the rising edge of E1,
respectively.
Features
8192 x 8 bit static CMOS RAM
250 and 500 ns Access Times
Common data inputs and data
outputs
Three-state outputs
Typ. operating supply current:
250 ns: 12 mA
Description
The UL6264A is
a static RAM
manufactured using a CMOS pro-
cess technology with the following
operating modes:
- Read
- Write
- Standby
- Data Retention
500 ns: 7 mA
Standby current < 5 µA
Standby current at 25 °C
and 3.3 V: typ. 50 nA
TTL/CMOS-compatible
Automatic reduction of power
dissipation in long Read or Write
cycles
Power supply voltage 3.3 V
Operating temperature ranges
0 to 70 °C
The memory array is based on a
6-transistor cell.
The circuit is activated by the rising
edge of E2 (at E1 = L) or the falling Data retention is guaranteed down
edge of E1 (at E2 H). The to 2 V.
=
address and control inputs open With the exception of E2, all inputs
simultaneously. According to the consist of NOR gates, so that no
information of W and G the data pull-up/pull-down
inputs, or outputs, are active. In the required. This gate circuit allows to
active state E1 = L and E2 = H, achieve low power standby require-
each address change leads to a ments by activation with TTL-levels
new Read or Write cycle. In a Read too.
cycle, the data outputs are activa- If the circuit is inactivated by E2 = L,
ted by the falling edge of G, after- the standby current (TTL) drops to
wards the data word read will be 100 µA typ.
resistors
are
-25 to 85 °C
-40 to 85 °C
Quality assessment according to
CECC 90000, CECC 90100 and
CECC 90111
ESD protection > 2000 V
(MIL STD 883C M3015.7)
Latch-up immunity > 100 mA
available at the outputs
DQ0 - DQ7. After the address
Pin Description
Pin Configuration
n.c.
A12
A7
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
VCC
W (WE)
E2 (CE2)
A8
2
3
A6
4
Signal Name Signal Description
A5
5
A9
A0 - A12
Address Inputs
Data In/Out
A4
6
A11
DQ0 - DQ7
A3
7
G (OE)
A10
PDIP
SOP
Chip Enable 1
Chip Enable 2
Output Enable
Write Enable
Power Supply Voltage
Ground
E1
A2
8
E2
A1
9
E (CE1)
DQ7
G
A0
10
11
12
13
14
W
DQ0
DQ1
DQ2
VSS
DQ6
VCC
VSS
DQ5
DQ4
not connected
n.c.
DQ3
Top View
December 12, 1997
1