M48Z58 M48Z58Y 5 V, 64 Kbit (8 Kbit x 8) ZEROPOWER® SRAM Features ■ Integrated, ultra low power SRAM, power-fail control circuit, and battery ■ READ cycle time equals WRITE cycle time ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages: (VPFD = power-fail deselect voltage) – M48Z58: VCC = 4.75 to 5.5 V; 4.5 V ≤ VPFD ≤ 4.75 V – M48Z58Y: VCC = 4.5 to 5.5 V; 4.2 V ≤ VPFD ≤ 4.
Contents M48Z58, M48Z58Y Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.
M48Z58, M48Z58Y List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 READ mode AC characteristics . . .
List of figures M48Z58, M48Z58Y List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. 4/24 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 SOIC connections . . . . . .
M48Z58, M48Z58Y 1 Description Description The M48Z58/Y ZEROPOWER® RAM is an 8 Kbit x 8 non-volatile static RAM that integrates power-fail deselect circuitry and battery control logic on a single die. The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory solution. The M48Z58/Y is a non-volatile pin and function equivalent to any JEDEC standard 8 K x 8 SRAM.
Description M48Z58, M48Z58Y Table 1. Signal names A0-A12 Address inputs DQ0-DQ7 Figure 2. Data inputs / outputs E Chip enable input G Output enable input W WRITE enable input VCC Supply voltage VSS Ground NC Not connected internally DIP connections NC A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS Figure 3.
M48Z58, M48Z58Y Figure 4.
Operating modes 2 M48Z58, M48Z58Y Operating modes The M48Z58/Y also has its own power-fail detect circuit. The control circuitry constantly monitors the single 5 V supply for an out of tolerance condition. When VCC is out of tolerance, the circuit write protects the SRAM, providing a high degree of data security in the midst of unpredictable system operation brought on by low VCC.
M48Z58, M48Z58Y Figure 5. Operating modes READ mode AC waveforms tAVAV VALID A0-A12 tAVQV tAXQX tELQV tEHQZ E tELQX tGLQV tGHQZ G tGLQX DQ0-DQ7 VALID AI01385 Note: WRITE enable (W) = High. Table 3.
Operating modes Figure 6. M48Z58, M48Z58Y WRITE enable controlled, WRITE mode AC waveforms tAVAV A0-A12 VALID tAVWH tWHAX tAVEL E tWLWH tAVWL W tWLQZ tWHQX tWHDX DQ0-DQ7 DATA INPUT tDVWH AI01386 Figure 7.
M48Z58, M48Z58Y Table 4.
Operating modes 2.4 M48Z58, M48Z58Y VCC noise and negative going transients ICC transients, including those produced by output switching, can produce voltage fluctuations, resulting in spikes on the VCC bus. These transients can be reduced if capacitors are used to store energy which stabilizes the VCC bus. The energy stored in the bypass capacitors will be released as low going spikes are generated or energy will be absorbed when overshoots occur. A ceramic bypass capacitor value of 0.
M48Z58, M48Z58Y 3 Maximum ratings Maximum ratings Stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. These are stress ratings only and 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 device reliability. Table 5.
DC and AC parameters 4 M48Z58, M48Z58Y DC and AC parameters This section summarizes the operating and measurement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC characteristic tables are derived from tests performed under the measurement conditions listed in Table 6: Operating and AC measurement conditions. Designers should check that the operating conditions in their projects match the measurement conditions when using the quoted parameters.
M48Z58, M48Z58Y Table 8. DC characteristics Symbol ILI ILO(2) DC and AC parameters Test condition(1) Parameter Input leakage current Output leakage current Min Max Unit 0 V ≤ VIN ≤ VCC ±1 µA 0 V ≤ VOUT ≤ VCC ±1 µA Outputs open 50 mA E = VIH 3 mA E = VCC – 0.2 V 3 mA ICC Supply current ICC1 Supply current (standby) TTL ICC2 Supply current (standby) CMOS VIL Input low voltage –0.3 0.8 V VIH Input high voltage 2.2 VCC + 0.3 V VOL Output low voltage IOL = 2.1 mA 0.
DC and AC parameters Table 9. M48Z58, M48Z58Y Power down/up AC characteristics Parameter(1) Symbol tPD tF (2) Min E or W at VIH before power down Max Unit 0 µs VPFD (max) to VPFD (min) VCC fall time 300 µs VPFD (min) to VSS VCC fall time 10 µs tR VPFD (min) to VPFD (max) VCC rise time 10 µs tRB VSS to VPFD (min) VCC rise time 1 µs trec VPFD (max) to inputs recognized 40 tFB(3) 200 ms 1. Valid for ambient operating temperature: TA = 0 to 70 °C; VCC = 4.75 to 5.5 V or 4.5 to 5.
M48Z58, M48Z58Y 5 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 11. PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package outline A2 A1 B1 B A L C e1 eA e3 D N E 1 PCDIP Note: Drawing is not to scale.
Package mechanical data M48Z58, M48Z58Y Figure 12. SOH28 – 28-lead plastic small outline, battery SNAPHAT®, pack. outline A2 A C B eB e CP D N E H A1 α L 1 SOH-A Note: Drawing is not to scale. Table 12. SOH28 – 28-lead plastic small outline, battery SNAPHAT®, pack. mech. data mm inches Symbol Typ Min A Typ Min 3.05 Max 0.120 A1 0.05 0.36 0.002 0.014 A2 2.34 2.69 0.092 0.106 B 0.36 0.51 0.014 0.020 C 0.15 0.32 0.006 0.012 D 17.71 18.49 0.697 0.728 E 8.23 8.
M48Z58, M48Z58Y Package mechanical data Figure 13. SH – 4-pin SNAPHAT® housing for 48 mAh battery, package outline A1 A2 A3 A eA B L eB D E SHZP-A Note: Drawing is not to scale. Table 13. SH – 4-pin SNAPHAT® housing for 48 mAh battery, package mech. data mm inches Symbol Typ Min Max A1 6.73 A2 6.48 A Typ Min Max 7.24 0.265 0.285 6.99 0.255 0.275 9.78 A3 0.385 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 14.22 14.99 0.560 0.590 eA 15.
Package mechanical data M48Z58, M48Z58Y Figure 14. SH – 4-pin SNAPHAT® housing for 120 mAh battery, package outline A1 A2 A3 A eA B L eB D E SHZP-A Note: Drawing is not to scale. Table 14. SH – 4-pin SNAPHAT® housing for 120 mAh battery, pack. mech. data mm inches Symb Typ Min A Typ Min 10.54 Max 0.415 A1 8.00 8.51 0.315 0.335 A2 7.24 8.00 0.285 0.315 A3 20/24 Max 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 17.27 18.03 0.680 0.
M48Z58, M48Z58Y 6 Part numbering Part numbering Table 15. Ordering information scheme Example: M48Z 58Y –70 MH 1 E Device type M48Z Supply voltage and write protect voltage 58(1) = VCC = 4.75 to 5.5 V; VPFD = 4.5 to 4.75 V 58Y = VCC = 4.5 to 5.5 V; VPFD = 4.2 to 4.
Environmental information 7 M48Z58, M48Z58Y Environmental information Figure 15. Recycling symbols This product contains a non-rechargeable lithium (lithium carbon monofluoride chemistry) button cell battery fully encapsulated in the final product. Recycle or dispose of batteries in accordance with the battery manufacturer's instructions and local/national disposal and recycling regulations.
M48Z58, M48Z58Y 8 Revision history Revision history Table 17. Document revision history Date Revision March 1999 1 Changes First issue 10-Feb-2000 1.1 2-socket SOH and 2-pin SH packages removed 22-Feb-2000 1.2 Data retention mode paragraph changed 14-Sep-2001 2 29-May-2002 2.1 Modify reflow time and temperature footnotes (Table 5) 16-Sep-2002 2.2 Remove footnote from ordering information (Table 15) 02-Apr-2003 3 v2.
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