M48Z08 M48Z18 5 V, 64 Kbit (8 Kb x 8) ZEROPOWER® SRAM Features ■ Integrated, ultra low power SRAM and powerfail control circuit ■ Unlimited WRITE cycles ■ READ cycle time equals WRITE cycle time ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages (VPFD = power-fail deselect voltage): – M48Z08: VCC = 4.75 to 5.5 V; 4.5 V ≤ VPFD ≤ 4.75 V – M48Z18: VCC = 4.5 to 5.5 V; 4.2 V ≤ VPFD ≤ 4.
Contents M48Z08, M48Z18 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.
M48Z08, M48Z18 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. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 READ mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . .
List of figures M48Z08, M48Z18 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. 4/20 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M48Z08, M48Z18 1 Description Description The M48Z08/18 ZEROPOWER® RAM is an 8 K x 8 non-volatile static RAM which is pin and function compatible with the DS1225. The monolithic chip provides a highly integrated battery-backed memory solution. The M48Z08/18 is a non-volatile pin and function equivalent to any JEDEC standard 8 K x 8 SRAM.
Description Figure 2. M48Z08, M48Z18 DIP connections NC A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS Figure 3.
M48Z08, M48Z18 2 Operation modes Operation modes The M48Z08/18 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.
Operation modes Figure 4. M48Z08, M48Z18 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.
M48Z08, M48Z18 Figure 5. Operation modes WRITE enable controlled, WRITE mode AC waveform tAVAV A0-A12 VALID tAVWH tWHAX tAVEL E tWLWH tAVWL W tWLQZ tWHQX tWHDX DQ0-DQ7 DATA INPUT tDVWH AI01386 Figure 6.
Operation modes Table 4.
M48Z08, M48Z18 2.4 Operation modes 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.
Maximum ratings 3 M48Z08, M48Z18 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.
M48Z08, M48Z18 4 DC and AC parameters 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 the relevant tables. Designers should check that the operating conditions in their projects match the measurement conditions when using the quoted parameters. Table 6.
DC and AC parameters Table 8. DC characteristics Symbol ILI ILO(2) M48Z08, M48Z18 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 80 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.
M48Z08, M48Z18 DC and AC parameters Table 9. Power down/up AC characteristics Parameter(1) Symbol Min Max Unit tPD E or W at VIH before power down 0 - µs tF(2) VPFD (max) to VPFD (min) VCC fall time 300 - µs tFB(3) VPFD (min) to VSS VCC fall time 10 - µs tR VPFD (min) to VPFD (max) VCC rise time 0 - µs tRB VSS to VPFD (min) VCC rise time 1 - µs trec E or W at VIH before power-up 2 - ms 1. Valid for ambient operating temperature: TA = 0 to 70 °C; VCC = 4.75 to 5.
Package mechanical data 5 M48Z08, M48Z18 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 10. 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.
M48Z08, M48Z18 6 Part numbering Part numbering Table 12. Ordering information scheme Example: M48Z 08 –100 PC 1 TR Device Type M48Z Supply voltage and write protect voltage 08 = VCC = 4.75 to 5.5 V; VPFD = 4.5 to 4.75 V 18 = VCC = 4.5 to 5.5 V; VPFD = 4.2 to 4.
Environmental information 7 M48Z08, M48Z18 Environmental information Figure 11. 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.
M48Z08, M48Z18 8 Revision history Revision history Table 13. Document revision history Date Revision Changes Mar-1999 1 First issue 19-Jul-2001 2 2-socket SOH and 2-pin SH packages removed; reformatted; temperature information added to tables (Table 7, 8, 3, 4, 9, 10) 19-Dec-2001 2.1 Remove all references to “clock” 21-Dec-2001 2.2 Changes to text to reflect addition of M48Z08Y option 20-May-2002 2.3 Modify reflow time and temperature footnotes (Table 5) 10-Sep-2002 2.
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