1 November 01, 2001
UL62H1616B
Preliminary
F65536 x 16 bit static CMOS RAM
F15 and 20 ns Access Time
FCommon data inputs and
data outputs
FThree-state outputs
FStandby curre nt < 50 µA at 1 25°C
FPower supply voltage 2.5 V
FOperating temperature range
K-Type:-40 °C to 85 °C
A-Type:-40 °C to 125 °C
FCECC 90000 Qua lity Standard
FESD protection > 2000 V
(MIL STD 883C M3015.7)
FLatch-up im mun ity >100 mA
FPackage: SOP44 (525 m il)
The UL62H1616B is a static RAM
manufactured using a CMOS pro-
cess technology with the following
operating modes:
- Lower / Upper Byte Read
- Word Read
- Lower / Upper Byte Write
- Word Write
- Standby
- Data Retention
The memory array is based on a
6-Transistor cell.
The circuit is activated by the fal-
ling edge of E. The address and
control inputs open simul taneously.
According to the information of W
and G, the data inputs, or outputs,
are active. During the active state
E = L and W = H each address
change lead s to a new Read cycle.
In a Read cycle, the data outputs
are activated by the falling edge of
G. If LB = L the data lower byte will
be available at the outputs DQ0-
DQ7, on UB = L the data upper
byte appear at the outputs DQ8-
DQ15. After the address change,
the data outputs go High-Z until the
new information is available. The
data outputs have no preferred
st ate. The Read cycle is finished by
the falling edge of W, or by the
rising edge of E, respecti ve ly.
Data retention is guaranteed down
to 2 V. With the exception of E, all
inputs consist of NOR gates, so
that no pull-up/pull-down resistors
are required.
Lo w Voltage Autom o tive Fast 64K x 16 SRAM
Pin Confi gur a tion
Top View
Signal Name Signa l Description
A0 - A15 Address Inputs
DQ0 - DQ15 Data In/Out
EChip Enable
GOutpu t Enable
WWrite Enable
UB Upper Byte Enable
LB Lower Byte Enable
VCC Power Supply Volta ge
VSS Ground
n.c. not connecte d
Pin Description
1
A4
VCC
35
2A3 A6
34
4A1 G
32
5A0 UB
31
3A2 A7
33
6E
A5
30
7DQ0 LB
29
8DQ1 DQ15
28
12VSS
A8
24
9DQ2
DQ9
27
10DQ3
DQ8
26
11VCC
n.c.
25
13DQ4
A9
23
14DQ5
A10
38
SOP
15
16
17
18
19
20
22
21
36
37
39
40
41
42
43
44
DQ7
W
A15
A14
A13
A12
n.c.
DQ6
DQ14
DQ13
DQ12
VSS
DQ11
DQ10
n.c.
A11
Features Description