DS1220Y 16k Nonvolatile SRAM

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1 Not Recommended for New Design DS122Y 16k Nonvolatile SRAM FEATURES years minimum data retention in the absence of external power Data is automatically protected during power loss Directly replaces 2k x 8 volatile static RAM or EEPROM Unlimited write cycles Low-power CMOS JEDEC standard 24-pin DIP package Read and write access times as fast as ns Full ±% operating range Optional industrial temperature range of -4 C to +85 C, designated IND PIN ASSIGNMENT A7 A6 A5 A4 A3 A2 A1 A DQ DQ1 DQ2 GND VCC A8 A9 WE OE A CE DQ7 DQ6 DQ5 DQ4 DQ3 24-Pin ENCAPSULATED PACKAGE 72-mil EXTENDED PIN DESCRIPTION A-A DQ-DQ7 CE WE OE V CC GND - Address Inputs - Data In/Data Out - Chip Enable - Write Enable - Output Enable - Power (+5V) - Ground DESCRIPTION The DS122Y 16k Nonvolatile SRAM is a 16,384-bit, fully static, nonvolatile RAM organized as 248 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors V CC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. The NV SRAM can be used in place of existing 2k x 8 SRAMs directly conforming to the popular bytewide 24-pin DIP standard. The DS122Y also matches the pinout of the 2716 EPROM or the 2816 EEPROM, allowing direct substitution while enhancing performance. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing. 1 of

2 DS122Y READ MODE The DS122Y executes a read cycle whenever WE (Write Enable) is inactive (high) and CE (Chip Enable) and OE (Output Enable) are active (low). The unique address specified by the 11 address inputs (A-A) defines which of the 248 bytes of data is to be accessed. Valid data will be available to the eight data output drivers within t ACC (Access Time) after the last address input signal is stable, providing that CE and OE access times are also satisfied. If CE and OE access times are not satisfied, then data access must be measured from the later-occurring signal and the limiting parameter is either t CO for CE or t OE for OE rather than address access. WRITE MODE The DS122Y executes a write cycle whenever the WE and CE signals are active (low) after address inputs are stable. The later-occurring falling edge of CE or WE will determine the start of the write cycle. The write cycle is terminated by the earlier rising edge of CE or WE. All address inputs must be kept valid throughout the write cycle. WE must return to the high state for a minimum recovery time (t WR ) before another cycle can be initiated. The OE control signal should be kept inactive (high) during write cycles to avoid bus contention. However, if the output drivers are enabled ( CE and OE active) then WE will disable the outputs in t ODW from its falling edge. DATA RETENTION MODE The DS122Y provides full-functional capability for V CC greater than 4.5 volts and write protects at 4.25 nominal. Data is maintained in the absence of V CC without any additional support circuitry. The DS122Y constantly monitors V CC. Should the supply voltage decay, the NV SRAM automatically write protects itself, all inputs become don t care, and all outputs become high-impedance. As V CC falls below approximately 3. volts, a power switching circuit connects the lithium energy source to RAM to retain data. During power-up, when V CC rises above approximately 3. volts, the power switching circuit connects external V CC to RAM and disconnects the lithium energy source. Normal RAM operation can resume after V CC exceeds 4.5 volts. 2 of 8

3 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature Caution: Do Not Reflow -.3V to +7.V C to 7 C; -4 C to +85 C for IND parts -4 C to +7 C; -4 C to +85 C for IND parts +26 C for seconds (Wave or Hand Solder Only) DS122Y This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. RECOENDED DC OPERATING CONDITIONS (T A : See Note ) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Power Supply Voltage V CC V Input Logic 1 V IH 2.2 V CC V Input Logic V IL. +.8 V DC ELECTRICAL CHARACTERISTICS (T A : See Note ; V CC = 5V ± %) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Leakage Current I IL A I/O Leakage Current I IO A CE V IH V CC Output 2.4V I OH -1. ma Output I OL 2. ma Standby Current CE =2.2V I CCS ma Standby Current CE =V CC -.5V I CCS ma Operating Current t CYC = 2ns I CCO1 75 ma (Commercial) Operating Current t CYC =2ns I CCO1 85 ma (Industrial) Write Protection Voltage V TP 4.25 V CAPACITANCE (T A = 25 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Capacitance C IN 5 pf Input/Output Capacitance C I/O 5 12 pf 3 of 8

4 DS122Y AC ELECTRICAL CHARACTERISTICS (T A : See Note ; V CC =5.V ± %) DS122Y- DS122Y-12 DS122Y-15 DS122Y-2 PARAMETER SYM UNITS MIN MAX MIN MAX MIN MAX MIN MAX Read Cycle Time t RC ns Access Time t ACC ns OE to Output Valid CE to Output Valid t OE ns t CO ns OE or CE to Output Active t COE ns 5 Output High Z from Deslection t OD ns 5 Output Hold from Address Change t OH ns Write Cycle Time t WC ns Write Pulse Width t WP ns 3 Address Setup Time t AW ns Write Recovery t WR1 ns 12 Time t WR2 ns 13 Output High Z from WE t ODW ns 5 Output Active from WE t OEW ns 5 Data Setup Time t DS ns 4 Data Hold Time t DH1 t DH2 ns ns NOTE of 8

5 READ CYCLE DS122Y SEE NOTE 1 WRITE CYCLE 1 SEE NOTES 2, 3, 4, 6, 7, 8 AND 12 WRITE CYCLE 2 SEE NOTES 2, 3, 4, 6, 7, 8 AND 13 5 of 8

6 POWER-DOWN/POWER-UP CONDITION DS122Y SEE NOTE 11 POWER-DOWN/POWER-UP TIMING PARAMETER SYMBOL MIN MAX UNITS NOTES CE at V IH before Power-Down t PD s 11 V CC Slew from V TP to V t F s V CC Slew from V to V TP t R s CE at V IH after Power-Up t REC 2 ms (T A = 25 C) PARAMETER SYMBOL MIN MAX UNITS NOTES Expected Data Retention Time t DR years 9 WARNING: Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery backup mode. NOTES: 1. WE is high for a read cycle. 2. OE = V IH or V IL. If OE = V IH during a write cycle, the output buffers remain in a high impedance state. 3. t WP is specified as the logical AND of CE and WE. t WP is measured from the latter of CE or WE going low to the earlier of CE or WE going high. 4. t DS are measured from the earlier of CE or WE going high. 5. These parameters are sampled with a 5 pf load and are not % tested. 6. If the CE low transition occurs simultaneously with or later than the WE low transition in write cycle 1, the output buffers remain in a high impedance state during this period. 6 of 8

7 DS122Y 7. If the CE high transition occurs prior to or simultaneously with the WE high transition, the output buffers remain in a high impedance state during this period. 8. If WE is low or the WE low transition occurs prior to or simultaneously with the CE low transition, the output buffers remain in a high impedance state during this period. 9. Each DS122Y is marked with a 4-digit date code AABB. AA designates the year of manufacture. BB designates the week of manufacture. The expected t DR is defined as starting at the date of manufacture.. All AC and DC electrical characteristics are valid over the full operating temperature range. For commercial products, this range is C to 7 C. For industrial products (IND), this range is -4 C to +85 C. 11. In a power-down condition the voltage on any pin may not exceed the voltage of V CC. 12. t WR1, t DH1 are measured from WE going high. 13. t WR2, t DH2 are measured from CE going high. 14. DS122Y modules are recognized by Underwriters Laboratory (U.L. ) under file E99151 (R). DC TEST CONDITIONS Outputs open. All voltages are referenced to ground. AC TEST CONDITIONS Output Load: pf + 1TTL Gate Input Pulse Levels: -3.V Timing Measurement Reference Levels Input:1.5V Output: 1.5V Input Pulse Rise and Fall Times: 5ns ORDERING INFORMATION PART NUMBER TEMPERATURE SUPPLY SPEED PIN/PACKAGE RANGE TOLERANCE GRADE DS122Y- C to +7 C 5V % 24 / 72 EMOD ns DS122Y-+ C to +7 C 5V % 24 / 72 EMOD ns DS122Y-IND -4 C to +85 C 5V % 24 / 72 EMOD ns DS122Y-IND+ -4 C to +85 C 5V % 24 / 72 EMOD ns DS122Y-12 C to +7 C 5V % 24 / 72 EMOD 12ns DS122Y-12+ C to +7 C 5V % 24 / 72 EMOD 12ns DS122Y-15 C to +7 C 5V % 24 / 72 EMOD 15ns DS122Y-15+ C to +7 C 5V % 24 / 72 EMOD 15ns DS122Y-2 C to +7 C 5V % 24 / 72 EMOD 2ns DS122Y-2+ C to +7 C 5V % 24 / 72 EMOD 2ns DS122Y-2IND -4 C to +85 C 5V % 24 / 72 EMOD 2ns DS122Y-2IND+ -4 C to +85 C 5V % 24 / 72 EMOD 2ns + Denotes lead-free/rohs-compliant product. 7 of 8

8 DS122Y NONVOLATILE SRAM, 24-PIN 72-MIL EXTENDED MODULE DS122Y PKG 24-PIN DIM MIN MAX A IN B IN C IN D IN E IN F IN G IN H IN J IN K IN of 8

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