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January 2005
(R)
AS7C4098 AS7C34098
5V/3.3V 256K x 16 CMOS SRAM
Features
* AS7C4098 (5V version) * AS7C34098 (3.3V version) * Industrial and commercial temperature * Organization: 262,144 words x 16 bits * Center power and ground pins * High speed
- 10/12/15/20 ns address access time - 5/6/7/8 ns output enable access time
* Low power consumption: STANDBY
- 110 mW (AS7C4098)/max CMOS - 72 mW (AS7C34098)/max CMOS
* Individual byte read/write controls * Easy memory expansion with CE, OE inputs * TTL- and CMOS-compatible, three-state I/O * 44-pin JEDEC standard packages * ESD protection 2000 volts * Latch-up current 100 mA
- 400-mil SOJ - TSOP 2
* Low power consumption: ACTIVE
- 1375 mW (AS7C4098)/max @ 12 ns - 576 mW (AS7C34098)/max @ 10 ns
Logic block diagram
A0 A1 A2 A3 A4 A6 A7 A8 A12 A13 I/O1-I/O8 I/O9-I/O16 WE VCC 1024 x 256 x 16 Array (4,194,304) GND
Pin arrangement for SOJ and TSOP 2
44-pin (400 mil) SOJ TSOP2
A0 A1 A2 A3 A4 CE I/O1 I/O2 I/O3 I/O4 VCC GND I/O5 I/O6 I/O7 I/O8 WE A5 A6 A7 A8 A9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 A17 A16 A15 OE UB LB I/O16 I/O15 I/O14 I/O13 GND VCC I/O12 I/O11 I/O10 I/O9 NC A14 A13 A12 A11 A10
I/O buffer
Row Decoder
Control circuit Column decoder
A5 A9 A10 A11 A14 A15 A16 A17
UB OE LB CE
Selection guide
-10 Maximum address access time Maximum output enable access time Maximum operating current Maximum CMOS standby current AS7C4098 AS7C34098 AS7C4098 AS7C34098 10 5 - 160 - 20 -12 12 6 250 130 20 20 -15 15 7 220 110 20 20 -20 20 8 180 100 20 20 Unit ns ns mA mA mA mA
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Copyright (c) Alliance Semiconductor. All rights reserved.
AS7C4098 AS7C34098
(R)
Functional description
The AS7C4098 and AS7C34098 are high-performance CMOS 4,194,304-bit Static Random Access Memory (SRAM) devices organized as 262,144 words x 16 bits. They are designed for memory applications where fast data access, low power, and simple interfacing are desired. Equal address access and cycle times (tAA, tRC, tWC) of 10/12/15/20 ns with output enable access times (tOE) of 5/6/7/8 ns are ideal for high-performance applications. The chip enable input CE permits easy memory expansion with multiple-bank memory systems. When CE is High the device enters standby mode. The standard AS7C4098/AS7C34098 is guaranteed not to exceed 110/ 72mW power consumption in CMOS standby mode. A write cycle is accomplished by asserting write enable (WE) and chip enable (CE). Data on the input pins I/O1-I/O16 is written on the rising edge of WE (write cycle 1) or CE (write cycle 2). To avoid bus contention, external devices should drive I/O pins only after outputs have been disabled with output enable (OE) or write enable (WE). A read cycle is accomplished by asserting output enable (OE) and chip enable (CE), with write enable (WE) High. The chip drives I/O pins with the data word referenced by the input address. When either chip enable or output enable is inactive, or write enable is active, output drivers stay in high-impedance mode. These devices provide multiple center power and ground pins, and separate byte enable controls, allowing individual bytes to be written and read. LB controls the lower bits, I/O1-I/O8, and UB controls the higher bits, I/O9-I/O16. All chip inputs and outputs are TTL- and CMOS-compatible, and operation is from either a single 5V (AS7C4098) or 3.3V (AS7C34098) supply. Both devices are available in the JEDEC standard 400-mL, 44-pin SOJ and TSOP 2 packages.
Absolute maximum ratings
Parameter Voltage on VCC relative to GND Voltage on any pin relative to GND Power dissipation Storage temperature Ambient temperature with VCC applied DC current into outputs (low) Device AS7C4098 AS7C34098 Symbol Vt1 Vt1 Vt2 PD Tstg Tbias IOUT Min -0.50 -0.50 -0.50 - -65 -55 - Max +7.0 +5.0 VCC +0.50 1.5 +150 +125 20 Unit V V V W C C mA
Note: 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 outside those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Truth table
CE H L L L
WE X H X H
OE X H X L
LB X X H L H L L
UB X X H H L L H L L
I/O1-I/O8 High Z High Z DOUT High Z DOUT DIN High Z DIN
I/O9-I/O16 High Z High Z High Z DOUT DOUT High Z DIN DIN
Mode Standby (ISB, ISB1) Output disable (ICC)
Read (ICC)
L
L
X
H L
Write (ICC)
Key: X = Don't care, L = Low, H = High.
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Recommended operating conditions
Parameter AS7C4098 Supply voltage AS7C34098 AS7C34098 AS7C4098 Input voltage commercial industrial AS7C34098 Symbol VCC (12/15/20) VCC (10) VCC (12/15/20) VIH VIH VIL1 Ambient operating temperature TA TA Min Typical 4.5 3.15 3.0 2.2 2.0 -0.5 0 -40 5.0 3.3 3.3 - - - - - Max 5.5 3.6 3.6 VCC + 0.5 VCC + 0.5 0.8 70 85 Unit V V V V V V C C
1 VIL min = -1.0V for pulse width less than 5ns.
DC operating characteristics (over the operating range)1
-10 Parameter Input leakage current Output leakage current Operating power supply current Symbol |ILI| Test conditions VCC = Max VIN = GND to VCC VCC = Max CE = VIH or OE = VIH or WE = VIL VI/O = GND to VCC VCC = Max Min cycle, 100% duty CE = VIL, IOUT = 0mA VCC = Max CE = VIH, f = Max AS7C4098/ AS7C34098 AS7C4098/ AS7C34098 AS7C4098 AS7C34098 AS7C4098 AS7C34098 -12 -15 -20 Min Max Min Max Min Max Min Max Unit - 1 - 1 - 1 - 1 A
|ILO|
- - - - - - - -
1 - 160 - 60 - 20 0.4 -
- - - - - - - - 2.4
1 250 130 60 60 20 20 0.4 -
- - - - - - - - 2.4
1 220 110 60 60 20 20 0.4 -
- - - - - - - - 2.4
1
A
180 mA 100 mA 60 60 20 20 0.4 - mA mA mA mA V V
ICC ISB
Standby power supply current
ISB1 VOL VOH
VCC = Max AS7C4098 CE VCC - 0.2V, VIN VCC - 0.2V or VIN 0.2V, f = 0 AS7C34098 IOL = 8 mA, VCC = Min IOH = -4 mA, VCC = Min AS7C4098/
Output voltage
AS7C34098 2.4
Capacitance (f = 1MHz, Ta = 25 C, VCC = NOMINAL)2
Parameter Input capacitance I/O capacitance Symbol CIN CI/O Signals A, CE, WE, OE, UB, LB I/O Test conditions VIN = 0V VIN = VOUT = 0V Max 6 8 Unit pF pF
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AS7C4098 AS7C34098
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Read cycle (over the operating range)3,9
-10 Parameter Read cycle time Address access time Chip enable (CE) access time Output enable (OE) access time Output hold from address change CE Low to output in low Z CE High to output in higfch Z OE Low to output in low Z OE High to output in high Z LB, UB access time LB, UB Low to output in low Z LB, UB High to output in high Z Power up time Power down time Symbol tRC tAA tACE tOE tOH tCLZ tCHZ tOLZ tOHZ tBA tBLZ tBHZ tPU tPD Min 10 - - - 3 0 - 0 - - 0 - 0 - Max - 10 10 5 - - 5 - 5 5 - 5 - 10 12 - - - 3 3 - 0 - - 0 - 0 - -12 Min Max - 12 12 6 - - 6 - 6 6 - 6 - 12 15 - - - 3 0 - 0 - - 0 - 0 - -15 Min Max - 15 15 7 - - 7 - 7 7 - 7 - 15 20 - - - 3 0 - 0 - - 0 - 0 - -20 Min Max - 20 20 8 - - 9 - 9 8 - 9 - 20 Unit Notes ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5 5 5 4, 5 4, 5 4, 5 4, 5
Key to switching waveforms
Rising input Falling input Undefined/don't care
Read waveform 1 (address controlled)6,7,9
tRC Address tOH DataOUT Previous data valid tAA Data valid tOH
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AS7C4098 AS7C34098
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Read waveform 2 (CE, OE, UB, LB controlled)6,8,9
tRC Address tAA OE tOLZ CE tACE tLZ LB, UB tBLZ DataOUT tBA Data valid tBHZ tCHZ tOE tOHZ tOH
Write cycle (over the operating range)11
-10 Parameter Write cycle time Chip enable (CE) to write end Address setup to write end Address setup time Write pulse width (OE = High) Write pulse width (OE = Low) Write recovery time Address hold from end of write Data valid to write end Data hold time Write enable to output in High-Z Output active from write end Byte enable Low to write end Symbol Min tWC tCW tAW tAS tWP1 tWP2 tWR tAH tDW tDH tWZ tOW tBW 10 7 7 0 7 10 0 0 5 0 0 3 7 Max - - - - - - - - - - 5 - - 12 8 8 0 8 12 0 0 6 0 0 3 8 - 6 - - -12 Min Max - - - - - - - - Min 15 10 10 0 10 15 0 0 7 0 0 3 10 -15 Max - - - - - - - - - - 7 - - Min 20 12 12 0 12 20 0 0 9 0 0 3 12 -20 Max - - - - - - - - - - 9 - - Unit ns ns ns ns ns ns ns ns ns ns ns ns ns 4, 5 4, 5 4, 5 4, 5 Note
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AS7C4098 AS7C34098
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Write waveform 1(WE controlled)10,11
tWC tAH tWR
Address tCW CE tBW LB, UB tAS WE tDW DataIN DataOUT Data undefined tWZ tDH Data valid tOW High Z tAW tWP
Write waveform 2 (CE controlled)10,11
tWC Address tAS CE tCW tAW tBW LB, UB tWP WE tDW DataIN DataOUT tCLZ High Z tWZ Data undefined Data valid tOW High Z tDH tAH tWR
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AS7C4098 AS7C34098
(R)
Write waveform 3 10,11
tWC tAH tWR
Address tAS CE tAW tBW LB, UB WE DataIN DataOUT High Z tWZ Data undefined tWP tDW Data valid tDH High Z tCW
AC test conditions
Output load: see Figure B or Figure C. Input pulse level: GND to 3.0V. See Figure A. Input rise and fall times: 2 ns. See Figure A. Input and output timing reference levels: 1.5V.
+3.0V GND 90% 10% 2 ns Figure A: Input pulse 90% 10% Thevenin equivalent: D OUT +5V DOUT 255 480 C13 168 +1.728V (5V and 3.3V) +3.3V 320 C13
DOUT 350
GND Figure B: 5V Output load
GND Figure C: 3.3V Output load
Notes
1 2 3 4 5 6 7 8 9 10 11 12 13 During VCC power-up, a pull-up resistor to VCC on CE is required to meet ISB specification. This parameter is sampled, but not 100% tested. For test conditions, see AC Test Conditions, Figures A, B, C. tCLZ and tCHZ are specified with CL = 5pF as in Figure C. Transition is measured 500mV from steady-state voltage. This parameter is guaranteed, but not tested. WE is High for read cycle. CE and OE are Low for read cycle. Address valid prior to or coincident with CE transition Low. All read cycle timings are referenced from the last valid address to the first transitioning address. CE or WE must be High during address transitions. Either CE or WE asserting high terminates a write cycle. All write cycle timings are referenced from the last valid address to the first transitioning address. Not applicable. C = 30pF, except on High Z and Low Z parameters, where C = 5pF.
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AS7C4098 AS7C34098
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Typical DC and AC characteristics12
1.4 1.2 Normalized ICC, ISB 1.0 0.8 0.6 0.4 0.2 0.0 MIN NOMINAL Supply voltage (V) MAX ISB Normalized ICC, ISB ICC Normalized supply current ICC, ISB vs. supply voltage VCC 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -55 -10 35 80 125 Ambient temperature (C) Normalized access time tAA vs. ambient temperature Ta ISB Normalized supply current ICC, ISB vs. ambient temperature Ta Normalized ISB1 (log scale) 625 25 5 1 0.2 0.04 -55 -10 35 80 125 Ambient temperature (C) Normalized supply current ISB1 vs. ambient temperature Ta
ICC
VCC = VCC(NOMINAL)
1.5 Normalized access time 1.4 1.3 1.2 1.1 1.0 0.9 0.8 MIN
Normalized access time tAA vs. supply voltage VCC
1.5 Normalized access time 1.4 1.3 1.2 1.1 1.0 0.9 0.8 -55
1.4 1.2 Normalized ICC 1.0 0.8 0.6 0.4 0.2
Normalized supply current ICC vs. cycle frequency 1/tRC, 1/tWC
Ta = 25 C
VCC = VCC(NOMINAL)
VCC = VCC(NOMINAL) Ta = 25 C
NOMINAL Supply voltage (V) Output source current IOH vs. output voltage VOH
MAX
-10 35 80 125 Ambient temperature (C) Output sink current IOL vs. output voltage VOL
0.0
0
25 50 75 Cycle frequency (MHz)
100
140 Output source current (mA) 120 100 80 60 40 20 0 0
140 Output sink current (mA) 120 100 80 60 40 20 0 0
35 30 Change in tAA (ns) 25 20 15 10 5 0 VCC 0
Typical access time change tAA vs. output capacitive loading
VCC = VCC(NOMINAL)PL Ta = 25 C
VCC = VCC(NOMINAL) Ta = 25 C
VCC = VCC(NOMINAL)
Output voltage (V)
VCC
Output voltage (V)
250 500 750 Capacitance (pF)
1000
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AS7C4098 AS7C34098
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Package dimensions
44 434241403938373635343332313029282726252423 c
44-pin TSOP 2
e He
1 2 3 4 5 6 7 8 9 101112131415161718 19202122 d A2 A1 b E l 0-5
A
A A1 A2 b c d e He E l
44-pin TSOP 2 Min (mm) Max (mm) 1.2 0.05 0.15 0.95 1.05 0.30 0.45 0.21 0.12 18.31 18.52 10.06 10.26 11.68 11.94 0.80 (typical) 0.40 0.60
e 44-pin SOJ Pin 1 B A1 b
D E1E2
c A Seating Plane A2 E
A A1 A2 B b c D E E1 E2 e
44-pin SOJ 400 mils Min(mils) Max(mils) 0.128 0.148 0.025 0.105 0.115 0.026 0.032 0.015 0.020 0.007 0.013 1.120 1.130 0.370 NOM 0.395 0.405 0.435 0.445 0.050 NOM
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AS7C4098 AS7C34098
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Ordering Codes
Package Version 5V commercial SOJ 5V industrial 3.3V commercial 3.3V industrial 5V commercial TSOP 2 5V industrial 3.3V commercial 3.3V industrial Note: Add suffix "N" to the above part number for lead free devices, Ex. AS7C4098-12JCN 10 ns NA NA AS7C34098-10JC NA NA NA AS7C34098-10TC NA 12 ns AS7C4098-12JC AS7C4098-12JI AS7C34098-12JC AS7C34098-12JI AS7C4098-12TC AS7C4098-12TI AS7C34098-12TC AS7C34098-12TI 15 ns AS7C4098-15JC AS7C4098-15JI AS7C34098-15JC AS7C34098-15JI AS7C4098-15TC AS7C4098-15TI AS7C34098-15TC AS7C34098-15TI 20 ns AS7C4098-20JC AS7C4098-20JI AS7C34098-20JC AS7C34098-20JI AS7C4098-20TC AS7C4098-20TI AS7C34098-20TC AS7C34098-20TI
Part numbering system
AS7C SRAM prefix X Voltage: Blank: 5V CMOS 3: 3.3V CMOS 4098 -XX J or T Packages: J: SOJ 400 mil T: TSOP 2 X N Device Access number time Temperature ranges: C: Commercial, 0C to 70C Lead free device I: Industrial, -40C to 85C
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(c) Copyright Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights, mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.

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