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U6264B
Standard 8K x 8 SRAM
Features
! 8192 x 8 bit static CMOS RAM ! 70 ns Access Times ! Common data inputs and
Description The U6264B is a static RAM manufactured using a CMOS process technology with the following operating modes: - Read - Standby - Write - Data Retention The memory array is based on a 6-transistor cell. The circuit is activated by the rising edge of E2 (at E1 = L), or the falling edge of E1 (at E2 = H). The address and control inputs open simultaneously. According to the information of W and G, the data inputs, or outputs, are active. In a Read cycle, the data outputs are activated by the falling edge of G, afterwards the data word read will be available at the outputs DQ0 DQ7. After the address change, the data outputs go High-Z until the new read information is available. The data outputs have no preferred state. If the memory is driven by CMOS levels in the active state, and if there is no change of the address, data input and control signals W or G, the operating current (at IO = 0 mA) drops to the value of the operating current in the Standby mode. The Read cycle is finished by the falling edge of E2 or W, or by the rising edge of E1, respectively. Data retention is guaranteed down to 2 V. With the exception of E2, all inputs consist of NOR gates, so that no pull-up/pull-down resistors are required. This gate circuit allows to achieve low power standby requirements by activation with TTL-levels too. If the circuit is inactivated by E2 = L, the standby current (TTL) drops to 150 A typ.
outputs
! Three-state outputs ! Typ. operating supply current
70 ns: 10 mA
! Standby current: ! Data retention current at 2 V: ! TTL/CMOS-compatible ! Automatic reduction of power
< 2 A at Ta 70 C < 1 A at Ta 70 C
! !
! ! ! !
dissipation in long Read or Write cycles Power supply voltage 5 V Operating temperature ranges: 0 to 70 C -40 to 85 C -40 to 125 C QS 9000 Quality Standard ESD protection > 2000 V (MIL STD 883C M3015.7) Latch-up immunity > 100 mA Packages: PDIP28 (600 mil) SOP28 (330 mil)
Pin Configuration
Pin Description
n.c. 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
Signal Name
VCC W (WE) E2 (CE2) A8 A9 A11 G (OE) A10 E1 (CE1) DQ7 DQ6 DQ5 DQ4 DQ3
Signal Description Address Inputs Data In/Out Chip Enable 1 Chip Enable 2 Output Enable Write Enable Power Supply Voltage Ground not connected
A0 - A12 DQ0 - DQ7 E1 E2 G W VCC VSS n.c.
PDIP 22 SOP 21
20 19 18 17 16 15
Top View April 20, 2004 1
U6264B
Block Diagram
A4 A5 A6 A7 A8 A9 A11 A12 A0 A1 A2 A3 A10
Row Decoder
Row Address Inputs
Memory Cell Array 256 Rows x 256 Columns
Column Address Inputs
Column Decoder
DQ0 Common Data I/O Sense Amplifier/ Write Control Logic DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 VCC VSS W G
Address Change Detector
Clock Generator
E2 E1
1
Truth Table Operating Mode Standby/not selected Internal Read Read Write
* H or L
E1 * H L L L
E2 L * H H H
W * * H H L
G * * H L *
DQ0 - DQ7 High-Z High-Z High-Z Data Outputs Low-Z Data Inputs High-Z
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U6264B
Characteristics
All voltages are referenced to VSS = 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 VIL = 0 V and VIH = 3 V. The timing reference level of all input and output signals is 1.5 V, with the exception of the tdis-times, in which cases transition is measured 200 mV from steady-state voltage.
Absolute Maximum Ratings a Power Supply Voltage Input Voltage Output Voltage Power Dissipation Operating Temperature C-Type K-Type A-Type C/K-Type A-Type
Symbol VCC VI VO PD Ta
Min. -0.3 -0.3 -0.3 0 -40 -40 -55 -65
Max. 7 VCC + 0.5 b VCC + 0.5 b 1 70 85 125 125 150 100
Unit V V V W C C C C C mA
Storage Temperature Output Short-Circuit Current at VCC = 5 V and VO = 0 V c
a
Tstg
| IOS |
b 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 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 Maximum voltage is 7 V Not more than 1 output should be shorted at the same time. Duration of the short circuit should not exceed 30 s.
Recommended Operating Conditions Power Supply Voltage Data Retention Voltage Input Low Voltage d Input High Voltage
d
Symbol VCC VCC(DR) VIL VIH
Conditions
Min. 4.5 2.0 -0.3 2.2
Max. 5.5
Unit V V
0.8 VCC + 0.3
V V
-2 V at Pulse Width 10 ns
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U6264B
Electrical Characteristics Supply Current - Operating Mode Symbol ICC(OP) VCC VIL VIH tcW VCC VE1 = VE2 or VE2 C-Type K-Type A-Type VCC VE1 = VE2 or VE2 VCC(DR) VE1 = VE2 or VE2 C-Type K-Type A-Type VCC IOH VCC IOL VCC VOH VCC VOL VCC VIH C/K-Type A-Type VCC VIL C/K-Type A-Type VCC VOH C/K-Type A-Type VCC VOL C/K-Type A-Type Conditions = 5.5 V = 0.8 V = 2.2 V = 70 ns = 5.5 V = VCC - 0.2 V = 0.2 V 2 5 100 = 5.5 V = 2.2 V = 0.8 V = 2V = VCC(DR) - 0.2 V = 0.2 V 1 3 50 = 4.5 V = -1.0 mA = 4.5 V = 3.2 mA = = = = 4.5 V 2.4 V 4.5 V 0.4 V 2.4 0.4 -1 3.2 A A A V V mA mA 3 A A A mA Min. Max. 55 Unit mA
Supply Current - Standby Mode (CMOS level)
ICC(SB)
Supply Current - Standby Mode (TTL level) Supply Current - Data Retention Mode
ICC(SB)1
ICC(DR)
Output High Voltage Output Low Voltage Output High Current Output Low Current Input Leakage Current High
VOH VOL IOH IOL
IIH
= 5.5 V = 5.5 V = 5.5 V = 0V -1 -2 = 5.5 V = 5.5 V = 5.5 V = 0V -1 -2 A A 1 2 A A A A 1 2 A A
Low
IIL
Output Leakage Current High at Three-State Outputs
IOHZ
Low at Three-State Outputs
IOLZ
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U6264B
Switching Characteristics Alt. Time to Output in Low-Z Cycle Time Write Cycle Time Read Cycle Time Access Time E1 LOW or E2 HIGH to Data Valid G LOW to Data Valid Address to Data Valid Pulse Widths Write Pulse Width Chip Enable to End of Write Setup Times Address Setup Time Chip Enable to End of Write Write Pulse Width Data Setup Time Data Hold Time Address Hold from End of Write Output Hold Time from Address Change E1 HIGH or E2 LOW to Output in High-Z W LOW to Output in High-Z G HIGH to Output in High-Z tLZ tWC tRC tACE tOE tAA tWP tCW tAS tCW tWP tDS tDH tAH tOH tHZCE tHZWE tHZOE Symbol IEC tt(QX) tcW tcR ta(E) ta(G) ta(A) tw(W) tw(E) tsu(A) tsu(E) tsu(W) tsu(D) th(D) th(A) tv(A) tdis(E) tdis(W) tdis(G) Min. 5 70 70 50 65 0 65 50 35 0 0 5 0 0 0 25 30 25 70 40 70 Max. 10 Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Data Retention Mode E1-Controlled
4.5 V VCC(DR) 2 V 2.2 V tDR 0V Data Retention trec 2.2 V E1 0V VCC
Data Retention Mode E2-Controlled
VCC VCC(DR) 2 V tDR 0.8 V Data Retention VE2(DR) 0.2 V trec 0.8 V E2
4.5 V
VE2(DR) VCC(DR) - 0.2 V or V E2(DR) 0.2 V VCC(DR) - 0.2 V VE1(DR) V CC(DR) + 0.3 V
Chip Deselect to Data Retention Time Operating Recovery Time
tDR : trec :
min 0 ns min tcR
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U6264B
Test Configuration for Functional Check
5V A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 E1 E2 W G VCC DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7
Input level according to the
relevant test measurement
VIH
VIL
ment of all 8 output pins
Simultaneous measure-
960
VO 30 pFe 510
VSS
e
In measurement of tdis(E), tdis(W), tdis(G) the capacitance is 5 pF.
Capacitance Input Capacitance Output Capacitance
Conditions VCC = 5.0 V VI = VSS f Ta = 1 MHz = 25 C
Symbol CI CO
Min.
Max. 8 10
Unit pF pF
All pins not under test must be connected with ground by capacitors. Ordering Code Example Type Package D = PDIP28 (600 mil, only C/K-Type) S = SOP28 (330 mil) Type 1 S2 = SOP28 (330 mil) Type 2 Operating Temperature Range C = 0 to 70 C K = -40 to 85 C A = -40 to 125 C
f
U6264B S2
K
07
LL Leadfree Option blank = Standard Package G1 = Leadfree Green Package f Power Consumption blank = Standard (only A-Type) LL = Very Low Power (C/K-Type)
Access Time 07 = 70 ns
on special request
Device Marking (example) Product specification Assembly location and trace code Internal Code
ZMD U6264BS2K 07LL C 0425 1 ZZ G1
Date of manufacture (The first 2 digits indicating the year, and the last 2 digits the calendar week.) Leadfree Green Package
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U6264B
Read Cycle 1 (during Read cycle: E1 = G = VIL, E2 = W = VIH)
tcR
Ai DQi
Output Previous Data Valid tv(A)
Addresses Valid ta(A) Output Data Valid
Read Cycle 2 (during Read cycle: W = VIH)
tcR
Ai E1
tsu(A) tsu(A)
Addresses Valid ta(E) tt(QX) ta(E) tt(QX) ta(G) tdis(G) tt(QX) tdis(E) tdis(E)
E2 G DQi
Output High-Z
Output Data Valid
Write Cycle 1 (W-controlled)
tcW
Ai E1 E2 W DQi
Input tdis(W) tsu(A)
Addresses Valid tsu(E) th(A)
tsu(E) tw(W) tsu(D) th(D) tt(QX)
Input Data Valid High-Z
DQi
Output
G
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U6264B
Write Cycle 2 (E1-controlled)
tcW
Ai E1 E2 W DQi
Input tsu(A)
Addresses Valid tw(E)
th(A)
tsu(E) tsu(W) tsu(D) tt(QX) tdis(W) th(D) Input Data Valid High-Z
DQi
Output
G
Write Cycle 3 (E2-controlled)
tcW
Ai E1
tsu(A)
Addresses Valid tsu(E)
th(A)
E2 W DQi
Input tt(QX)
tw(E) tsu(W) tsu(D) tdis(W) th(D) Input Data Valid High-Z
DQi
Output
G
undefined
L- or H-level
The information describes the type of component and shall not be considered as assured characteristic. Terms of delivery and rights to change design reserved.
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April 20, 2004
U6264B
LIFE SUPPORT POLICY ZMD products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the ZMD product could create a situation where personal injury or death may occur. Components used in life-support devices or systems must be expressly authorized by ZMD for such purpose.
LIMITED WARRANTY The information in this document has been carefully checked and is believed to be reliable. However Zentrum Mikroelektronik Dresden AG (ZMD) makes no guarantee or warranty concerning the accuracy of said information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon it. The information in this document describes the type of component and shall not be considered as assured characteristics. ZMD does not guarantee that the use of any information contained herein will not infringe upon the patent, trademark, copyright, mask work right or other rights of third parties, and no patent or licence is implied hereby. This document does not in any way extent ZMD's warranty on any product beyond that set forth in its standard terms and conditions of sale. ZMD reserves terms of delivery and reserves the right to make changes in the products or specifications, or both, presented in this publication at any time and without notice.
April 20, 2004
Zentrum Mikroelektronik Dresden AG Grenzstrae 28 * D-01109 Dresden * P. O. B. 80 01 34 * D-01101 Dresden * Germany Phone: +49 351 8822 306 * Fax: +49 351 8822 337 * Email: memory@zmd.de * http://www.zmd.de

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