IDT IDT7198S20DB Cmos static rams 64k (16k x 4-bit) added chip select and output control Datasheet


IDT7198S
IDT7198L
CMOS STATIC RAMs
64K (16K x 4-BIT)
Added Chip Select and Output Controls
Integrated Device Technology, Inc.
nized as 16K x 4. It is fabricated using IDT’s high-performance, high-reliability technology—CMOS. This state-of-theart technology, combined with innovative circuit design techniques, provides a cost effective approach for memory intensive applications.
Access times as fast as 20ns are available. The IDT7198
offers a reduced power standby mode, ISB1, which is activated
when CS1 or CS2 goes HIGH. This capability decreases
power, while enhancing system reliability. The low-power
version (L) also offers a battery backup data retention capability where the circuit typically consumes only 30µW when
operating from a 2V battery.
All inputs and outputs are TTL-compatible and operate
from a single 5V supply.
The lDT7198 is packaged in either a 24-pin ceramic DlP,
28-pin leadless chip carrier, and 24-pin CERPACK.
Military grade product is manufactured in compliance with
the latest revision of MIL-STD-883, Class B, making it ideally
suited to military temperature applications demanding the
highest level of performance and reliability.
FEATURES:
• Fast Output Enable (OE) pin available for added system
flexibility
• Multiple Chip Selects (CS1, CS2) simplify system design
and operation
• High speed (equal access and cycle times)
— Military: 20/25/35/45/55/70/85ns (max.)
• Low power consumption
• Battery back-up operation—2V data retention (L version
only)
• 24-pin CERDIP, high-density 28-pin leadless chip carrier,
and 24-pin CERPACK packaging available
• Produced with advanced CMOS technology
• Bidirectional data inputs and outputs
• Inputs/outputs TTL-compatible
• Military product compliant to MIL-STD-883, Class B
DESCRIPTION:
The IDT7198 is a 65,536 bit high-speed static RAM orga-
FUNCTIONAL BLOCK DIAGRAM
A0
VCC
GND
65,536-BIT
MEMORY ARRAY
DECODER
A13
I/O0
I/O1
I/O2
COLUMN I/O
INPUT
DATA
CONTROL
I/O3
CS1
CS2
WE1
OE
2985 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY TEMPERATURE RANGE
1994 Integrated Device Technology, Inc.
MAY 1994
6.4
DSC-1027/4
1
IDT7198S/L
CMOS STATIC RAM 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
MEMORY CONTROL
MILITARY TEMPERATURE RANGE
PIN DESCRIPTIONS
The IDT7198 64K high-speed CMOS static RAM incorporates two additional memory control features (an extra chip
select and an output enable pin) which offer additional benefits in many system memory applications.
Both chip selects, Chip Select 1 (CS1) and Chip Select 2
(CS2), must be LOW to select the memory. If either chip select
is pulled HIGH, the memory will be deselected and remain in
the standby mode. This dual chip select feature (CS1, CS2)
also brings the convenience of improved system speeds to the
large memory designer by reducing the external logic required
to perform decoding.
Name
Description
A0–A13
Address Inputs
CS1
Chip Select 1
CS2
Chip Select 2
WE
Write Enable
OE
Output Enable
I/O0–I/O3
Data I/O
VCC
Power
GND
Ground
2985 tbl 01
TRUTH TABLE(1)
PIN CONFIGURATIONS
Mode
A0
A1
A2
A3
A4
A5
A6
A7
A8
1
24
2
3
23
22
4
21
5
20
D24-1
E24-1
6
8
19
18
17
9
16
CS 1
10
15
OE
11
16
GND
12
15
7
V CC
A 13
A 12
A 11
A 10
A9
CS 2
I/O 3
I/O 2
I/O 1
I/O 0
CS1
CS2
WE
OE
I/O
Power
Standby
H
X
X
X
High-Z
Standby
Standby
X
H
X
X
High-Z
Standby
Read
L
L
H
L
DOUT
Active
Write
L
L
L
X
DIN
Active
Read
L
L
H
H
High-Z
Active
NOTE:
1. H = VIH, L = VIL, X = don't care.
WE
2985 drw 02
ABSOLUTE MAXIMUM RATINGS(1)
DIP/SOJ/CERPACK
TOP VIEW
Symbol
VTERM
A0
NC
NC
V CC
NC
3
4
1
28 27
26
5
25
6
24
7
23
L28-2
8
22
9
21
10
20
11
19
18
12
13 14 15 16 17
OE
GND
CS 2
WE
I/O 0
A1
A2
A3
A4
A5
A6
A7
A8
CS 1
2
NC
A 13
A 12
A 11
A 10
A9
I/O3
I/O2
I/O1
Rating
Mil.
Unit
Terminal Voltage
with Respect to GND
–0.5 to +7.0
V
Operating Temperature
–55 to +125
°C
TBIAS
Temperature
Under Bias
–65 to +135
°C
TSTG
Storage Temperature
–65 to +150
°C
TA
INDEX
2985 tbl 02
PT
IOUT
Power Dissipation
1.0
W
DC Output Current
50
mA
NOTE:
2985 tbl 03
1. 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 these or any other
conditions 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.
2985 drw 03
LCC
TOP VIEW
6.4
2
IDT7198S/L
CMOS STATIC RAMS 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
RECOMMENDED DC OPERATING
CONDITIONS
Symbol
MILITARY TEMPERATURE RANGE
RECOMMENDED OPERATING
TEMPERATURE AND SUPPLY VOLTAGE
Parameter
Min.
Typ.
Max. Unit
VCC
Supply Voltage
4.5
5.0
5.5
V
GND
Supply Voltage
0
0
0
V
VIH
Input High Voltage
2.2
—
6.0
V
VIL
Input Low Voltage
–0.5(1)
—
0.8
V
Grade
Ambient Temperature
Military
–55°C to +125°C
GND
VCC
0V
5V ± 10%
2985 tbl 06
CAPACITANCE (TA = +25°C, f = 1.0MHz, VCC = 0V)
Parameter(1)
Symbol
NOTE:
2985 tbl 05
1. VIL (min.) = -3.0V for pulse width less than 20ns, once per cycle.
CIN
Input Capacitance
CI/O
I/O Capacitance
Conditions
Max.
Unit
VIN = 0V
7
pF
VOUT = 0V
7
pF
NOTE:
2985 tbl 04
1. This parameter is determined by device characterization, but is not
production tested.
DC ELECTRICAL CHARACTERISTICS
VCC = 5.0V ± 10%, Military Temperature Range Only
IDT7198S
Symbol
Parameter
Test Condition
IDT7198L
Min.
Max.
Min.
Max.
Unit
|ILI|
Input Leakage Current
VCC = Max.,
VIN = GND to VCC
—
10
—
5
µA
|ILO|
Output Leakage Current
VCC = Max., CS = VIH,
VOUT = GND to VCC
—
10
—
5
µA
VOL
Output Low Voltage
IOL = 10mA, VCC = Min.
0.5
—
0.5
V
IOL = 8mA, VCC = Min.
—
0.4
—
0.4
IOH = –4mA, VCC = Min.
2.4
—
2.4
—
VOH
Output High Voltage
V
2985 tbl 07
AC TEST CONDITIONS
Input Pulse Levels
GND to 3.0V
Input Rise/Fall Times
5ns
Input Timing Reference Levels
1.5V
Output Reference Levels
1.5V
AC Test Load
See Figures 1 and 2
2985 tbl 10
5V
5V
480Ω
480Ω
DATA OUT
DATA OUT
255Ω
255Ω
30pF*
2985 drw 05
5pF*
2985 drw 06
Figure 1. AC Test Load
Figure 2. AC Test Load
(for tCLZ1, 2, tOLZ, tCHZ1, 2, tOHZ, tOW and tWHZ)
*Includes scope and jig capacitances
6.4
3
IDT7198S/L
CMOS STATIC RAM 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
MILITARY TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS(1)
(VCC = 5V ± 10%, VLC = 0.2V, VHC = VCC - 0.2V)
Symbol
ICC1
ICC2
ISB
ISB1
7198S20
7198L20
7198S25
7198L25
7198S35
7198L35
Power
Military
Military
Military
Military
Military
Military
Unit
Operating Power
Supply Current, CS1 and
CS2 ≤ VIL, Outputs Open
VCC = Max., f = 0(2)
S
105
105
105
105
105
105
mA
L
80
80
80
80
80
80
Dynamic Operating
Current, CS1 and
CS2 ≤ VIL, Outputs Open
VCC = Max., f = fMAX(2)
S
160
155
140
140
140
140
L
130
120
115
110
110
105
Standby Power Supply
Current (TTL Level), CS1
or CS2 ≥ VIH, VCC = Max.,
Outputs Open, f = fMAX(2)
S
70
60
50
50
50
50
L
50
40
35
35
35
35
Full Standby Power
Supply Current (CMOS
Level) CS1 or CS2 ≥ V HC,
VCC= Max., VIN ≥ VHC or
VIN ≤ VLC, f = 0(2)
S
25
20
20
20
20
20
L
1.5
1.5
1.5
1.5
1.5
1.5
Parameter
7198S45 7198S55/70 7198S85
7198L45 7198L55/70 7198L85
NOTES:
1. All values are maximum guaranteed values.
2. At f = fMAX address and data inputs are cycling at the maximum frequency of read cycles of 1/tRC. f = 0 means no input lines change.
mA
mA
mA
2985 tbl 06
DATA RETENTION CHARACTERISTICS OVER MILITARY TEMPERATURE RANGE
(L Version Only) VLC = 0.2V, VHC = VCC - 0.2V
Typ. (1)
VCC @
Symbol
Parameter
VDR
VCC for Data Retention
ICCDR
Data Retention Current
tCDR(3)
Chip Deselect to Data
Retention Time
tR(3)
Operation Recovery Time
(3)
|ILI|
Test Condition
Min.
—
2.0v
Max.
VCC @
3.0V
2.0V
3.0V
Unit
2.0
—
—
—
—
V
—
10
15
600
900
µA
0
—
—
—
—
ns
or CS2 ≥ VHC
VIN ≥ VHC or ≤ VLC
CS1
tRC(2)
—
—
—
—
ns
—
—
—
2
2
µA
Input Leakage Current
NOTES:
2985 tbl 09
1. TA = +25°C.
2. tRC = Read Cycle Time.
3. This parameter is guaranteed by device characterization but is not production tested.
LOW VCC DATA RETENTION WAVEFORM
VCC
4.5V
4.5V
VDR ≥2V
t CDR
CS
DATA
RETENTION
MODE
V IH
VDR
tR
V IH
2985 drw 04
6.4
4
IDT7198S/L
CMOS STATIC RAMS 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
MILITARY TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS (VCC = 5.0V ± 10%, Military Temperature Range)
7198S20
7198L20
Symbol
Parameter
7198S25
7198L25
7198S35/45
7198L35/45
7198S55
7198L55
7198S70
7198L70
7198S85
7198L85
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Unit
Read Cycle
tRC
tAA
—
35/45
—
55
—
70
—
85
—
ns
19
—
25
—
35/45 —
55
—
70
—
85
ns
Chip Select-1,2 Access Time
—
20
—
25
—
35/45 —
55
—
70
—
85
ns
(2)
Chip Select-1,2 to Output in Low-Z
5
—
5
—
5
5
—
5
—
5
—
ns
Output Enable to Output Valid
—
9
—
11
—
20/25 —
35
—
45
—
55
ns
Output Enable to Output in Low-Z
5
—
5
—
5
—
5
—
5
—
5
—
ns
Chip Select 1,2 to Output in High-Z
—
8
—
10
—
14
—
20
—
25
—
30
ns
Output Disable to Output in High-Z
—
8
—
9
—
15
—
20
—
25
—
30
ns
tCHZ1,2
(2)
tOH
25
—
(2)
tOHZ
—
Address Access Time
tOE
tOLZ
20
(1)
tACS1,2
tCLZ1,2
Read Cycle Time
(2)
—
Output Hold from Address Change
5
—
5
—
5
—
5
—
5
—
5
—
ns
tPU
(2)
Chip Select to Power Up Time
0
—
0
—
0
—
0
—
0
—
0
—
ns
tPD
(2)
Chip Deselect to Power Down Time
—
20
—
25
—
35/45 —
55
—
70
—
85
ns
NOTES:
1. Both chip selects must be active low for the device to be selected.
2. This parameter is guaranteed by device characterization but is not production tested.
2985 tbl 11
TIMING WAVEFORM OF READ CYCLE NO. 1(1)
tRC
ADDRESS
tAA
tOH
OE
tOLZ
CS1,
tOE
(5)
tOHZ
(5)
2
tACS1, 2
tCLZ1, 2
tCHZ1, 2
(5)
(5)
DATA VALID
DATAOUT
2985 drw 07
NOTES:
1. WE is HIGH for Read cycle.
2. Device is continuously selected, CS1 is LOW, CS2 is LOW.
3. Address valid prior to or coincident with CS1 and or CS2 transition LOW.
4. OE is LOW.
5. Transition is measured ±200mV from steady state voltage.
6.4
5
IDT7198S/L
CMOS STATIC RAM 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
MILITARY TEMPERATURE RANGE
TIMING WAVEFORM OF READ CYCLE NO. 2(1, 2, 4)
tRC
ADDRESS
tAA
tOH
tOH
PREVIOUS DATA VALID
DATAOUT
DATA VALID
2985 drw 08
TIMING WAVEFORM OF READ CYCLE NO. 3(1, 3, 4)
CS1,2
tCHZ1, 2
tACS1, 2
(5)
tCLZ1, 2 (5)
DATAOUT
DATA VALID
tPU
tPD
ICC
VCC SUPPLY
CURRENT ISB
2985 drw 09
NOTES:
1. WE is HIGH for Read cycle.
2. Device is continuously selected, CS1 is LOW, CS2 is LOW.
3. Address valid prior to or coincident with CS1 and or CS2 transition LOW.
4. OE is LOW.
5. Transition is measured ±200mV from steady state voltage.
AC ELECTRICAL CHARACTERISTICS (VCC = 5.0V ± 10%, All Temperature Ranges)
7198S20
7198L20
Symbol
Parameter
7198S25
7198L25
7198S35/45
7198L35/45
Min. Max. Min. Max. Min.
7198S55
7198L55
7198S70
7198L70
7198S85
7198L85
Max. Min. Max. Min. Max. Min. Max. Unit
Write Cycle
Write Cycle Time
17
—
20
—
30/40
—
50
—
60
—
75
—
ns
tCW1,2(1) Chip Select to End-of-Write
17
—
20
—
25/35
—
50
—
60
—
75
—
ns
17
—
20
—
25/35
—
50
—
60
—
75
—
ns
tWC
tAW
Address Valid to End-of-Write
tAS
Address Set-up Time
0
—
0
—
0
—
0
—
0
—
0
—
ns
tWP
Write Pulse Width
17
—
20
—
25/35
—
50
—
60
—
75
—
ns
tWR1,2
Write Recovery Time
0
—
0
—
0
—
0
—
0
—
0
—
ns
tWHZ(2)
Write Enable to Output in High-Z
—
5/6
—
7
—
10/15 —
25
—
30
—
40
ns
tDW
Data Valid to End-of-Write
10
—
13
—
15/20
—
25
—
30
—
35
—
ns
tDH
Data Hold Time
0
—
0
—
0
—
0
—
0
—
0
—
ns
tOW(2)
Output Active from End-of-Write
5
—
5
—
5
—
5
—
5
—
5
—
NOTES:
1. Both chip selects must be active low for the device to be selected.
2. This parameter is guaranteed by device characterization but is not production tested.
6.4
ns
2985 tbl 12
6
IDT7198S/L
CMOS STATIC RAMS 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
MILITARY TEMPERATURE RANGE
TIMING WAVEFORM OF WRITE CYCLE NO. 1 (WE CONTROLLED TIMING)(1, 2, 3, 7)
tWC
ADDRESS
OE
tAW
CS1,
2
tWP (7)
tAS
tWR
WE
tWHZ (6)
tOW
(6)
(4)
DATAOUT
(4)
tDW
DATAIN
tDH
DATA VALID
2985 drw 10
TIMING WAVEFORM OF WRITE CYCLE NO. 2 (CS CONTROLLED TIMING)(1)
tWC
ADDRESS
tAW
CS1,
2
tAS
tCW
tWR
WE
tDW
DATAIN
tDH
DATA VALID
2985 drw 11
NOTES:
1. WE, CS1 or CS2 must be HIGH during all address transitions.
2. A write occurs during the overlap (tWP) of a LOW WE, a LOW CS1 and a LOW CS2.
3. tWR is measured from the earlier of CS1, CS2 or WE going HIGH to the end of the write cycle.
4. During this period, the I/O pins are in the output state, and input signals must not be applied.
5. If the CS LOW transition occurs simultaneously with or after the WE LOW transition, outputs remain in the high-impedance state.
6. Transition is measured ±200mV from steady state.
7. If OE is LOW during a WE controlled write cycle, the write pulse width must be the larger of tWP or (tWHZ + tDW) to allow the I/O drivers to turn off and data
to be placed on the required tDW. If OE is HIGH during a WE controlled write cycle, this requirement does not apply and the write pulse can be as short
as the specified tWP.
6.4
7
IDT7198S/L
CMOS STATIC RAM 64K (16K x 4-BIT) Added Chip Select and Output Enable Controls
MILITARY TEMPERATURE RANGE
ORDERING INFORMATION
IDT7198
X
XX
X
B
Device
Type
Power
Speed
Package
Process/
Temperature
Range
6.4
B
Military (–55°C to +125°C)
Compliant to MIL-STD-883, Class B
D
L
E
300 mil Ceramic DIP (D24-1)
Leadless Chip Carrier (L28-2)
CERPACK (E24-1)
20
25
35
45
55
70
85
Military Only
Military Only
Military Only
Military Only
Military Only
Military Only
Military Only
S
L
Standard Power
Low Power
Speed in nanoseconds
2985 drw 12
8
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