U631H256
SoftStore
32K x 8 nvSRAM
Features
High-performance CMOS non-
volatile static RAM 32768 x 8 bits
25, 35 and 45 ns Access Times
10, 15 and 20 ns Output Enable
Access Times
Software STORE Initiation
Automatic STORE Timing
10
6
STORE cycles to EEPROM
100 years data retention in
EEPROM
Automatic RECALL on Power Up
Software RECALL Initiation
Unlimited RECALL cycles from
EEPROM
Unlimited Read and Write to
SRAM
Single 5 V
±
10 % Operation
Operating temperature ranges:
0 to 70
°C
-40 to 85
°C
-55 to 125 °C (only 35 ns)
QS 9000 Quality Standard
ESD protection > 2000 V
(MIL STD 883C M3015.7-HBM)
RoHS compliance and Pb- free
Packages:
PDIP28 (600 mil, only C/K-Type)
SOP28 (330 mil)
Description
The U631H256 has two separate
modes of operation: SRAM mode
and nonvolatile mode. In SRAM
mode, the memory operates as an
ordinary static RAM. In nonvolatile
operation, data is transferred in
parallel from SRAM to EEPROM or
from EEPROM to SRAM. In this
mode SRAM functions are disab-
led.
The U631H256 is a fast static RAM
(25, 35, 45 ns), with a nonvolatile
electrically
erasable
PROM
(EEPROM) element incorporated
in each static memory cell. The
SRAM can be read and written an
unlimited number of times, while
independent nonvolatile data resi-
des in EEPROM. Data transfers
from the SRAM to the EEPROM
(the STORE operation), or from the
EEPROM to the SRAM (the
RECALL operation) are initiated
through software sequences.
The U631H256 combines the high
performance and ease of use of a
fast SRAM with nonvolatile data
integrity.
Once a STORE cycle is initiated,
further input or output are disabled
until the cycle is completed.
Because a sequence of addresses
is used for STORE initiation, it is
important that no other read or
write accesses intervene in the
sequence or the sequence will be
aborted.
Internally, RECALL is a two step
procedure. First, the SRAM data is
cleared and second, the nonvola-
tile information is transferred into
the SRAM cells.
The RECALL operation in no way
alters the data in the EEPROM
cells. The nonvolatile data can be
recalled an unlimited number of
times.
The U631H256 is pin compatible
with standard SRAMs.
Pin Configuration
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
VCC
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Pin Description
Signal Name
A0 - A14
DQ0 - DQ7
E
G
W
VCC
VSS
Signal Description
Address Inputs
Data In/Out
Chip Enable
Output Enable
Write Enable
Power Supply Voltage
Ground
PDIP
22
SOP
21
20
19
18
17
16
15
Top View
April 7, 2005
1
U631H256
Block Diagram
A5
A6
A7
A8
A9
A11
A12
A13
A14
DQ0
DQ1
Input Buffers
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
E
W
EEPROM Array
512 x (64 x 8)
STORE
Row Decoder
SRAM
Array
512 Rows x
64 x 8 Columns
Store/
Recall
Control
V
CC
V
SS
RECALL
V
CC
Column I/O
Column Decoder
Software
Detect
A0 - A13
A0 A1 A2 A3 A4 A10
G
Truth Table for SRAM Operations
Operating Mode
Standby/not selected
Internal Read
Read
Write
*
H or L
Characteristics
All voltages are referenced to V
SS
= 0 V (ground).
All characteristics are valid in the power supply voltage range and in the operating temperature range specified.
Dynamic measurements are based on a rise and fall time of
≤
5 ns, measured between 10 % and 90 % of V
I
, as well as
input levels of V
IL
= 0 V and V
IH
= 3 V. The timing reference level of all input and output signals is 1.5 V,
with the exception of the t
dis
-times and t
en
-times, in which cases transition is measured
±
200 mV from steady-state voltage.
E
H
L
L
L
W
*
G
*
DQ0 - DQ7
High-Z
High-Z
Data Outputs Low-Z
Data Inputs High-Z
H
H
L
H
L
*
Absolute Maximum Ratings
a
Power Supply Voltage
Input Voltage
Output Voltage
Power Dissipation
Operating Temperature
C-Type
K-Type
M-Type
Symbol
V
CC
V
I
V
O
P
D
T
a
T
stg
Min.
-0.5
-0.3
-0.3
Max.
7
V
CC
+0.5
V
CC
+0.5
1
Unit
V
V
V
W
°C
°C
°C
°C
0
-40
-55
-65
70
85
125
150
Storage Temperature
a: Stresses greater than those listed under „Absolute Maximum Ratings“ may cause permanent damage to the device. This is a stress
rating only, and functional operation of the device at condition above those indicated in the operational sections of this specification is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
2
April 7, 2005
U631H256
DC Characteristics
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Input Leakage Current
High
Low
Output Leakage Current
High at Three-State- Output
Low at Three-State- Output
I
OHZ
I
OLZ
I
IH
I
IL
Symbol
V
CC
I
OH
I
OL
V
CC
V
OH
V
OL
V
CC
V
IH
V
IL
V
CC
E or G
V
OH
V
OL
Conditions
= 4.5 V
=-4 mA
= 8 mA
= 4.5 V
= 2.4 V
= 0.4 V
= 5.5 V
= 5.5 V
= 0V
= 5.5 V
≥
V
IH
= 5.5 V
= 0V
1
-1
µA
µA
Min.
Max.
Unit
V
OH
V
OL
I
OH
I
OL
2.4
0.4
-4
8
V
V
mA
mA
1
-1
µA
µA
SRAM Memory Operation
Switching Characteristics
No.
Read Cycle
1
2
3
4
5
6
7
8
9
Read Cycle Time
f
Address Access Time to Data Valid
g
Chip Enable Access Time to Data Valid
Output Enable Access Time to Data
Valid
E HIGH to Output in High-Z
h
G HIGH to Output in High-Z
h
E LOW to Output in Low-Z
G LOW to Output in Low-Z
Output Hold Time after Addr. Change
g
Symbol
Alt.
t
AVAV
t
AVQV
t
ELQV
t
GLQV
t
EHQZ
t
GHQZ
t
ELQX
t
GLQX
t
AXQX
t
ELICCH
t
EHICCL
IEC
t
cR
t
a(A)
t
a(E)
t
a(G)
t
dis(E)
t
dis(G)
t
en(E)
t
en(G)
t
v(A)
t
PU
t
PD
5
0
3
0
25
35
45
Unit
Min. Max. Min. Max. Min. Max.
25
25
25
10
10
10
5
0
3
0
25
35
35
35
35
15
13
13
5
0
3
0
45
45
45
45
20
15
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
10 Chip Enable to Power Active
e
11 Chip Disable to Power Standby
d, e
e:
f:
g:
h:
Parameter guaranteed but not tested.
Device is continuously selected with E and G both Low.
Address valid prior to or coincident with E transition LOW.
Measured
±
200 mV from steady state output voltage.
4
April 7, 2005
U631H256
Read Cycle 1: Ai-controlled (during Read cycle: E = G = V
IL
, W = V
IH
)
f
t
cR
(1)
Ai
Previous Data Valid
t
v(A)
(9)
Address Valid
t
a(A)
(2)
Output Data Valid
DQi
Output
Read Cycle 2: G-, E-controlled (during Read cycle: W = V
IH
)
g
t
cR
(1)
Ai
E
G
DQi
Output
High Impedance
Address Valid
t
a(A)
t
a(E)
(2)
(3)
t
en(E)
(7)
t
a(G)
t
en(G)
(8)
t
PU
(10)
ACTIVE
STANDBY
(4)
t
dis(E)
(5)
t
PD
(11)
t
dis(G)
Output Data Valid
(6)
I
CC
No. Switching Characteristics
Write Cycle
12
13
14
15
16
17
18
19
20
21
22
23
Write Cycle Time
Write Pulse Width
Write Pulse Width Setup Time
Address Setup Time
Address Valid to End of Write
Chip Enable Setup Time
Chip Enable to End of Write
Data Setup Time to End of Write
Data Hold Time after End of
Write
Address Hold after End of Write
W LOW to Output in High-Z
h, i
W HIGH to Output in Low-Z
Symbol
Alt. #1
Alt. #2
IEC
25
Min.
Max.
35
Min.
Max.
45
Unit
Min.
Max.
t
AVAV
t
WLWH
t
AVAV
t
cW
t
w(W)
25
20
20
0
20
20
20
10
0
0
10
5
35
25
25
0
25
25
25
12
0
0
13
5
45
30
30
0
30
30
30
15
0
0
15
5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
WLEH
t
AVWL
t
AVWH
t
ELWH
t
ELEH
t
DVWH
t
WHDX
t
WHAX
t
WLQZ
t
WHQX
t
DVEH
t
EHDX
t
EHAX
t
AVEL
t
AVEH
t
su(W)
t
su(A)
t
su(A-WH)
t
su(E)
t
w(E)
t
su(D)
t
h(D)
t
h(A)
t
dis(W)
t
en(W)
April 7, 2005
5
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