IDT IDT71028

IDT71028
CMOS STATIC RAM
1 MEG (256K x 4-BIT)
Integrated Device Technology, Inc.
FEATURES:
DESCRIPTION:
• 256K x 4 advanced high-speed CMOS static RAM
• Equal access and cycle times
— Commercial: 12/15/17/20ns
• One Chip Select plus one Output Enable pin
• Bidirectional data Inputs and outputs directly
TTL-compatible
• Low power consumption via chip deselect
• Available in 400 mil Plastic SOJ package
The IDT71028 is a 1,048,576-bit high-speed static RAM
organized as 256K x 4. It is fabricated using IDT’s highperfomance, high-reliability CMOS technology. This state-ofthe-art technology, combined with innovative circuit design
techniques, provides a cost-effective solution for high-speed
memory needs.
The IDT71028 has an output enable pin which operates as
fast as 6ns, with address access times as fast as 12ns. All
bidirectional inputs and outputs of the IDT71028 are TTLcompatible and operation is from a single 5V supply. Fully
static asynchronous circuitry is used, requiring no clocks or
refresh for operation.
The IDT71028 is packaged in 28-pin 400 mil Plastic SOJ
package.
FUNCTIONAL BLOCK DIAGRAM
A0
1,048,576-BIT
MEMORY
ARRAY
ADDRESS
DECODER
A17
I/O0 – I/O3
4
CS
WE
OE
4
I/O CONTROL
CONTROL
LOGIC
2966 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
1996 Integrated Device Technology, Inc.
AUGUST 1996
9.4
DSC-2966/5
1
IDT71028
CMOS STATIC RAM 1 MEG (256K x 4-BIT)
COMMERCIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
Symbol
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
CS
OE
GND
VCC
A17
A16
A15
A14
A13
A12
A11
NC
I/O3
I/O2
I/O1
I/O0
1
28
27
2
3
26
25
4
24
5
23
6
SO28-6
22
7
21
8
9
20
10
19
11
18
17
12
13
16
15
14
(2)
Rating
Unit
–0.5 to +7.0
V
0 to +70
°C
VTERM
Terminal Voltage with
Respect to GND
TA
Operating Temperature
TBIAS
Temperature Under
Bias
–55 to +125
°C
TSTG
Storage Temperature
–55 to +125
°C
PT
Power Dissipation
1.25
W
IOUT
DC Output Current
50
mA
WE
NOTES:
2966 tbl 02
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.
2. VTERM must not exceed VCC + 0.5V.
2966 drw 02
SOJ
TOP VIEW
TRUTH TABLE(1,2)
CAPACITANCE
(TA = +25°C, f = 1.0MHz, SOJ package)
CS
OE
WE
I/O
L
L
H
DATAOUT
Read Data
L
X
L
DATAIN
Write Data
CIN
Input Capacitance
CI/O
I/O Capacitance
Function
Symbol
L
H
H
High-Z
Output Disabled
H
X
X
High-Z
Deselected - Standby (ISB)
X
X
High-Z
Deselected - Standby (ISB1)
VHC(3)
Com’l.
NOTES:
1. H = VIH, L = VIL, x = Don't care.
2. VLC = 0.2V, VHC = VCC -0.2V.
3. Other inputs ≥VHC or ≤VLC.
Parameter(1)
Conditions
Max.
Unit
VIN = 3dV
8
pF
VOUT = 3dV
8
pF
NOTE:
2966 tbl 03
1. This parameter is guaranteed by device characterization, but not production tested.
2966 tbl 01
RECOMMENDED DC OPERATING
CONDITIONS
Symbol
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
—
VCC+0.5
V
—
0.8
V
VIL
Input Low Voltage
2.2
(1)
–0.5
NOTE:
2966 tbl 04
1. VIL (min.) = –1.5V for pulse width less than 10ns, once per cycle.
DC ELECTRICAL CHARACTERISTICS
VCC = 5.0V ± 10%
IDT71028
Symbol
Parameter
Test Condition
Min.
Max.
Unit
|ILI|
Input Leakage Current
VCC = Max., VIN = GND to VCC
—
5
µA
|ILO|
Output Leakage Current
VCC = Max., CS = VIH, VOUT = GND to VCC
—
5
µA
VOL
Output Low Voltage
IOL = 8mA, VCC = Min.
—
0.4
V
VOH
Output High Voltage
IOH = –4mA, VCC = Min.
2.4
—
V
2966 tbl 05
9.4
2
IDT71028
CMOS STATIC RAM 1 MEG (256K x 4-BIT)
COMMERCIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS(1)
(VCC = 5.0V ± 10%, VLC = 0.2V, VHC = VCC – 0.2V)
71028S12(3)
Symbol
Parameter
71028S15
71028S17
71028S20
Com'l. Mil. Com'l. Mil. Com'l. Mil.
Com'l. Mil.
Unit
ICC
Dynamic Operating Current,
CS ≤ VIL, Outputs Open,
VCC = Max., f = fMAX(2)
155
—
150
—
145
—
145
—
mA
ISB
Standby Power Supply Current
(TTL Level), CS ≥ VIH, Outputs Open,
VCC = Max., f = fMAX(2)
35
—
35
—
35
—
35
—
mA
ISB1
Full Standby Power Supply Current
(CMOS Level), CS ≥ VHC, Outputs Open,
VCC = Max., f = 0(2), VIN ≤ VLC or VIN ≥ VHC
10
—
10
—
10
—
10
—
mA
NOTES:
1. All values are maximum guaranteed values.
2. fMAX = 1/tRC (all address inputs are cycling at fMAX); f = 0 means no address input lines are changing.
3. 12ns specification is preliminary.
2966 tbl 06
AC TEST CONDITIONS
Input Pulse Levels
GND to 3.0V
Input Rise/Fall Times
3ns
Input Timing Reference Levels
1.5V
Output Reference Levels
1.5V
AC Test Load
See Figures 1 and 2
2966 tbl 07
5V
5V
480Ω
480Ω
DATA OUT
30pF
DATA OUT
255Ω
5pF*
2966 drw 03
255Ω
2966 drw 04
*Including jig and scope capacitance.
Figure 1. AC Test Load
Figure 2. AC Test Load
(for tCLZ, tOLZ, tCHZ, tOHZ, tOW, and tWHZ)
9.4
3
IDT71028
CMOS STATIC RAM 1 MEG (256K x 4-BIT)
COMMERCIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS (VCC = 5.0V ± 10%, Commercial Temperature Range)
Symbol
71028S12(1) 71028S15 71028S17
71028S20
Min. Max. Min. Max. Min. Max. Min. Max.
Parameter
Unit
Read Cycle
tRC
Read Cycle Time
12
—
15
—
17
—
20
—
ns
tAA
Address Access Time
—
12
—
15
—
17
—
20
ns
tACS
Chip Select Access Time
—
12
—
15
—
17
—
20
ns
(2)
Chip Select to Output in Low-Z
3
—
3
—
3
—
3
—
ns
(2)
Chip Deselect to Output in High-Z
0
6
0
7
0
8
0
8
ns
tCLZ
tCHZ
tOE
tOLZ
Output Enable to Output Valid
—
6
—
7
—
8
—
8
ns
(2)
Output Enable to Output in Low-Z
0
—
0
—
0
—
0
—
ns
(2)
Output Disable to Output in High-Z
0
5
0
5
0
6
0
7
ns
Output Hold from Address Change
4
—
4
—
4
—
4
—
ns
tOHZ
tOH
tPU
(2)
tPD(2)
Chip Select to Power Up Time
0
—
0
—
0
—
0
—
ns
Chip Deselect to Power Down Time
—
12
—
15
—
17
—
20
ns
Write Cycle
tWC
Write Cycle Time
12
—
15
—
17
—
20
—
ns
tAW
Address Valid to End of Write
10
—
12
—
13
—
15
—
ns
tCW
Chip Select to End of Write
10
—
12
—
13
—
15
—
ns
tAS
Address Set-up Time
0
—
0
—
0
—
0
—
ns
tWP
Write Pulse Width
10
—
12
—
13
—
15
—
ns
tWR
Write Recovery Time
0
—
0
—
0
—
0
—
ns
tDW
Data Valid to End of Write
7
—
8
—
9
—
9
—
ns
tDH
Data Hold Time
0
—
0
—
0
—
0
—
ns
tOW(2)
Output Active from End of Write
3
—
3
—
3
—
4
—
ns
tWHZ(2)
Write Enable to Output in High-Z
0
5
0
5
0
7
0
8
ns
NOTES:
1. 12ns specification is preliminary.
2. This parameter guaranteed with the AC load (Figure 2) by device characterization, but is not production tested.
9.4
2966 tbl 08
4
IDT71028
CMOS STATIC RAM 1 MEG (256K x 4-BIT)
COMMERCIAL TEMPERATURE RANGE
TIMING WAVEFORM OF READ CYCLE NO. 1(1)
tRC
ADDRESS
tAA
OE
tOE
tOLZ (5)
CS
tCLZ
DATAOUT
VCC SUPPLY ICC
CURRENT ISB
(5)
tACS
(3)
tCHZ
HIGH IMPEDANCE
(5)
tOHZ (5)
DATAOUT VALID
tPD
tPU
2966 drw 05
TIMING WAVEFORM OF READ CYCLE NO. 2(1,2,4)
tRC
ADDRESS
tAA
tOH
DATAOUT
tOH
PREVIOUS DATAOUT VALID
DATAOUT VALID
2966 drw 6
NOTES:
1. WE is HIGH for Read Cycle.
2. Device is continuously selected, CS is LOW.
3. Address must be valid prior to or coincident with the later of CS transition LOW; otherwise tAA is the limiting parameter.
4. OE is LOW.
5. Transition is measured ±200mV from steady state.
9.4
5
IDT71028
CMOS STATIC RAM 1 MEG (256K x 4-BIT)
COMMERCIAL TEMPERATURE RANGE
TIMING WAVEFORM OF WRITE CYCLE NO.1 (WE CONTROLLED TIMING)(1,2,3,5)
tWC
ADDRESS
tAW
CS
tWP(3)
tAS
tWR
WE
tWHZ
DATAOUT
(6)
tOW
(6)
HIGH IMPEDANCE
(4)
tDW
DATAIN
tCHZ
(6)
(4)
tDH
DATAIN VALID
2966 drw 07
TIMING WAVEFORM OF WRITE CYCLE NO.2 (CS CONTROLLED TIMING)(1,2,5)
tWC
ADDRESS
tAW
CS
tAS
tWR
tCW
WE
tDW
DATAIN
tDH
DATAIN VALID
2966 drw 08
NOTES:
1. WE or CS must be HIGH during all address transitions.
2. A write occurs during the overlap of a LOW CS and a LOW WE.
3. OE is continuously HIGH. If during a WE controlled write cycle OE is LOW, tWP must be greater than or equal to tWHZ + tDW to allow the I/O drivers to turn
off and data to be placed on the bus for the required tDW. If OE is HIGH during a WE controlled write cycle, this requirement does not apply and the
minimum write pulse is as short as the specified tWP.
4. During this period, 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, the outputs remain in a high-impedance state.
6. Transition is measured ±200mV from steady state.
9.4
6
IDT71028
CMOS STATIC RAM 1 MEG (256K x 4-BIT)
COMMERCIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT 71028
Device
Type
S
XX
XX
X
Power
Speed
Package
Process/
Temperature
Range
Blank
Commercial (0°C to +70°C)
Y
400-mil Small Outline J-Bend (SO28-6)
12
15
17
20
Speed in nanoseconds
2966 drw 09
9.4
7