SAMSUNG KM68257E-10

PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
Document Title
32Kx8 Bit High-Speed CMOS Static RAM(5V Operating)
Operated at Commercial and Industrial Temperature Ranges.
Revision History
Rev .No.
History
Rev. 0.0
Initial Draft
Draft Data
Aug. 1. 1998
Remark
Preliminary
The attached data sheets are prepared and approved by SAMSUNG Electronics. SAMSUNG Electronics CO., LTD. reserve the
right to change the specifications. SAMSUNG Electronics will evaluate and reply to your requests and questions on the parameters
of this device. If you have any questions, please contact the SAMSUNG branch office near your office, call or contact Headquarters.
-1-
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
32K x 8 Bit High-Speed CMOS Static RAM
FEATURES
GENERAL DESCRIPTION
• Fast Access Time 10, 12, 15ns(Max.)
• Low Power Dissipation
Standby (TTL)
: 20mA(Max.)
(CMOS) : 2mA(Max.)
Operating KM68257E - 10 : 80mA(Max.)
KM68257E - 12 : 80mA(Max.)
KM68257E - 15 : 80mA(Max.)
• Single 5.0V±10% Power Supply
• TTL Compatible Inputs and Outputs
• I/O Compatible with 3.3V Device
• Fully Static Operation
- No Clock or Refresh required
• Three State Outputs
• Standard Pin Configuration
KM68257EJ : 28-SOJ-300
KM68257ETG : 28-TSOP1-0813. 4F
The KM68257E is a 262,144-bit high-speed Static Random
Access Memory organized as 32,768 words by 8 bits. The
KM68257E uses 8 common input and output lines and has an
output enable pin which operates faster than address access
time at read cycle. The device is fabricated using SAMSUNG′s
advanced CMOS process and designed for high-speed circuit
technology. It is particularly well suited for use in high-density
high-speed system applications. The KM68257E is packaged in
a 300mil 28-pin plastic SOJ or TSOP1 forward.
PIN CONFIGURATION(Top View)
OE
A11
A9
A8
A13
WE
Vcc
A14
A12
A7
A6
A5
A4
A3
ORDERING INFORMATION
KM68257E -10/12/15
Commercial Temp.
KM68257EI -10/12/15
Industrial Temp.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TSOP1
A10
CS
I/O8
I/O7
I/O6
I/O5
I/O4
Vss
I/O3
I/O2
I/O1
A0
A1
A2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
FUNCTIONAL BLOCK DIAGRAM
Row Select
I/O1 ~I/O8
28 Vcc
A12 2
27 WE
A7 3
26 A13
A6 4
25 A8
A5 5
24 A9
A4 6
23 A11
Pre-Charge-Circuit
Clk Gen.
A0
A1
A2
A3
A4
A5
A6
A7
A8
A14 1
Memory Array
512 Rows
64x8 Columns
Data
Cont.
A3 7
I/O Circuit
Column Select
SOJ
22 OE
A2 8
21 A10
A1 9
20 CS
A0 10
19 I/O8
I/O1 11
18 I/O7
I/O2 12
17 I/O6
I/O3 13
16 I/O5
Vss 14
15 I/O4
CLK
Gen.
PIN FUNCTION
A9
A10
A11
A12 A13
A14
Pin Name
A0 - A14
CS
WE
OE
Address Inputs
WE
Write Enable
CS
Chip Select
OE
Output Enable
I/O1 ~ I/O8
-2-
Pin Function
Data Inputs/Outputs
VCC
Power(+5.0V)
VSS
Ground
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Rating
Unit
VIN, VOUT
-0.5 to 7.0
V
Voltage on VCC Supply Relative to VSS
VCC
-0.5 to 7.0
V
Power Dissipation
PD
1.0
W
TSTG
-65 to 150
°C
Voltage on Any Pin Relative to V SS
Storage Temperature
Operating Temperature
Commercial
TA
0 to 70
°C
Industrial
TA
-40 to 85
°C
* 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 operating sections of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS(TA=0 to 70°C)
Parameter
Symbol
Min
Typ
Max
Unit
Supply Voltage
VCC
4.5
5.0
5.5
V
Ground
VSS
0
0
0
V
Input High Voltage
VIH
2.2
-
VCC+0.5**
V
Input Low Voltage
VIL
-0.5*
-
0.8
V
NOTE: The above parameters are also guaranteed at industrial temperature range.
* VIL (Min) = -2.0(Pulse Width≤7ns) for I≤20mA
** VIH(Max) = VCC+2.0V(Pulse Width≤7ns) for I≤20mA
DC AND OPERATING CHARACTERISTICS(TA=0 to 70°C,VCC=5.0V±10% unless otherwise specified)
Min
Max
Unit
Input Leakage Current
ILI
VIN = VSS to VCC
-1
1
µA
Output Leakage Current
ILO
CS=VIH or OE=VIH or WE=VIL
VOUT = VSS to VCC
-1
1
µA
Operating Current
ICC
Min. Cycle, 100% Duty
CS=VIL, VIN = V IH or VIL,
IOUT=0mA
10ns
-
80
mA
12ns
-
80
15ns
Parameter
Symbol
Test Conditions
-
80
ISB
Min. Cycle, CS=VIH
-
20
mA
ISB1
f=0MHz, CS≥VCC-0.2V,
VIN≥VCC-0.2V or VIN≤0.2V
-
2
mA
Output Low Voltage Level
VOL
IOL=8mA
-
0.4
V
Output High Voltage Level
VOH
IOH=-4mA
2.4
-
V
-
3.95
V
Standby Current
VOH1*
IOH1=0.1mA
NOTE: The above parameters are also guaranteed at industrial temperature range.
* VCC=5.0V, Temp.=25°C
CAPACITANCE*(TA=25°C, f=1.0MHz)
Item
Symbol
Test Conditions
MIN
Max
Unit
Input/Output Capacitance
CI/O
VI/O=0V
-
8
pF
Input Capacitance
CIN
VIN=0V
-
7
pF
* NOTE : Capacitance is sampled and not 100% tested.
-3-
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
AC CHARACTERISTICS(TA=0 to 70°C, VCC=5.0V±10%, unless otherwise noted.)
TEST CONDITIONS
Parameter
Value
Input Pulse Levels
0V to 3V
Input Rise and Fall Times
3ns
Input and Output timing Reference Levels
1.5V
Output Loads
See below
NOTE : The above test conditions are also applied at industrial temperature range.
Output Loads(A)
Output Loads(B)
for tHZ, tLZ, tWHZ, tOW, tOLZ & tOHZ
+5V
+5.0V
480Ω
480Ω
DOUT
255Ω
DOUT
255Ω
30pF*
5pF*
* Including Scope and Jig Capacitance
READ CYCLE
KM68257E-10
KM68257E-12
KM68257E-15
Min
Max
Min
Max
Min
Max
tRC
10
-
12
-
15
-
ns
Address Access Time
tAA
-
10
-
12
-
15
ns
Chip Select to Output
tCO
-
10
-
12
-
15
ns
Output Enable to Valid Output
tOE
-
5
-
6
-
7
ns
Chip Enable to Low-Z Output
tLZ
3
-
3
-
3
-
ns
Output Enable to Low-Z Output
tOLZ
0
-
0
-
0
-
ns
Chip Disable to High-Z Output
tHZ
0
5
0
6
0
7
ns
Output Disable to High-Z Output
tOHZ
0
5
0
6
0
7
ns
Output Hold from Address Change
tOH
3
-
3
-
3
-
ns
Chip Selection to Power Up Time
tPU
0
-
0
-
0
-
ns
Chip Selection to Power DownTime
tPD
-
10
-
12
-
15
ns
Parameter
Read Cycle Time
Symbol
Unit
NOTE : The above parameters are also guaranteed at industrial temperature range.
-4-
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
WRITE CYCLE
Parameter
Symbol
KM68257E-10
KM68257E-12
KM68257E-15
Min
Max
Min
Max
Min
Max
Unit
Write Cycle Time
tWC
10
-
12
-
15
-
ns
Chip Select to End of Write
tCW
8
-
9
-
10
-
ns
Address Setup Time
tAS
0
-
0
-
0
-
ns
Address Valid to End of Write
tAW
8
-
9
-
10
-
ns
Write Pulse Width(OE High)
tWP
8
-
9
-
10
-
ns
Write Pulse Width(OE Low)
tWP1
10
-
12
-
15
-
ns
Write Recovery Time
tWR
0
-
0
-
0
-
ns
Write to Output High-Z
tWHZ
0
5
0
6
0
7
ns
Data to Write Time Overlap
tDW
5
-
6
-
7
-
ns
Data Hold from Write Time
tDH
0
-
0
-
0
-
ns
End Write to Output Low-Z
tOW
0
-
0
-
0
-
ns
NOTE : The above parameters are also guaranteed at industrial temperature range.
TIMMING DIAGRAMS
TIMING WAVEFORM OF READ CYCLE(1) (Address Controlled, CS=OE=VIL , WE=VIH)
tRC
Address
tAA
tOH
Data Out
Valid Data
Previous Valid Data
TIMING WAVEFORM OF READ CYCLE(2)
(WE=VIH)
tRC
Address
tAA
tCO
CS
tHZ(3,4,5)
tOHZ
tOE
OE
tOLZ
tOH
tLZ(4,5)
Data out
Valid Data
VCC
ICC
Current
ISB
tPU
tPD
50%
50%
-5-
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
NOTES(READ CYCLE)
1. WE is high for read cycle.
2. All read cycle timing is referenced from the last valid address to the first transition address.
3. tHZ and tOHZ are defined as the time at which the outputs achieve the open circuit condition and are not referenced to VOH or VOL
levels.
4. At any given temperature and voltage condition, tHZ(Max.) is less than tLZ(Min.) both for a given device and from device to
device.
5. Transition is measured ±200mV from steady state voltage with Load(B). This parameter is sampled and not 100% tested.
6. Device is continuously selected with CS=VIL.
7. Address valid prior to coincident with CS transition low.
8. For common I/O applications, minimization or elimination of bus contention conditions is necessary during read and write cycle.
TIMING WAVEFORM OF WRITE CYCLE(1)
(OE= Clock)
tWC
Address
tWR(5)
tAW
OE
tCW(3)
CS
tWP(2)
tAS(4)
WE
tDW
Data in
High-Z
tDH
Valid Data
tOHZ(6)
High-Z(8)
Data out
TIMING WAVEFORM OF WRITE CYCLE(2)
(OE=Low Fixed)
tWC
Address
tWR(5)
tAW
tCW(3)
CS
tAS(4)
tWP1(2)
WE
tDW
Data in
High-Z
tDH
Valid Data
tWHZ(6)
tOW
(10)
(9)
High-Z(8)
Data out
-6-
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
TIMING WAVEFORM OF WRITE CYCLE(3) (CS = Controlled)
tWC
Address
tAW
tWR(5)
tCW(3)
CS
tAS(4)
tWP(2)
WE
tDW
High-Z
Data in
Valid Data
tLZ
High-Z
tWHZ(6)
High-Z(8)
High-Z
Data out
tDH
NOTES(WRITE CYCLE)
1. All write cycle timing is referenced from the last valid address to the first transition address.
2. A write occurs during the overlap of a low CS and WE. A write begins at the latest transition CS going low and WE going low ;
A write ends at the earliest transition CS going high or WE going high. tWP is measured from the beginning of write to the end
of write.
3. t CW is measured from the later of CS going low to end of write.
4. t AS is measured from the address valid to the beginning of write.
5. t WR is measured from the end of write to the address change. tWR applied in case a write ends as CS or WE going high.
6. If OE, CS and WE are in the Read Mode during this period, the I/O pins are in the output low-Z state. Inputs of opposite phase
of the output must not be applied because bus contention can occur.
7. For common I/O applications, minimization or elimination of bus contention conditions is necessary during read and write cycle.
8. If CS goes low simultaneously with WE going or after WE going low, the outputs remain high impedance state.
9. Dout is the read data of the new address.
10. When CS is low : I/O pins are in the output state. The input signals in the opposite phase leading to the output should not be
applied.
FUNCTIONAL DESCRIPTION
CS
WE
OE
Mode
I/O Pin
Supply Current
H
X
X*
Not Select
High-Z
ISB, ISB1
L
H
H
Output Disable
High-Z
ICC
L
H
L
Read
DOUT
ICC
L
L
X
Write
DIN
ICC
* NOTE : X means Don′t Care.
-7-
Revision 0.0
August 1998
PRELIMINARY
CMOS SRAM
KM68257E, KM68257EI
PACKAGE DIMENSIONS
Units:millimeters/Inches
28-SOJ-300
#15
7.62
0.300
#28
8.51 ±0.12
0.335 ±0.005
6.86 ±0.25
0.270 ±0.010
+0.10
-0.05
0.20
#1
0.008+0.004
-0.002
#14
0.69 MIN
0.027
18.82
MAX
0.741
18.41 ±0.12
0.725 ±0.005
1.30
)
0.051
1.30
(
)
0.051
(
0.43
0.95
)
0.0375
+0.10
-0.05
0.017 +0.004
-0.002
1.27
0.050
0.71
0.10
0.004 MAX
+0.10
-0.05
0.028+0.004
-0.002
28-TSOP1-0813.4F
0.10 MAX
0.004 MAX
Units:millimeters/Inches
+0.10
-0.05
0.008 +0.004
-0.002
0.20
13.40 ±0.20
0.528 ±0.008
#28
#14
#15
(
8.40
0.331 MAX
#1
0.55
0.0217
0.25
0.010 TYP
0.425
)
0.017
8.00
0.315
(
3.76 MAX
0.148
1.00 ±0.10
0.039 ±0.004
11.80 ±0.10
0.465 ±0.004
0.15
0.006
+0.10
-0.05
+0.004
-0.002
1.20
0.047 MAX
0.05
0.002 MIN
0~8 °
0.45 ~0.75
0.018 ~0.030
(
-8-
0.50
)
0.020
Revision 0.0
August 1998