M48Z128_10 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 20
Technical content
Datasheet sections
- 1 Description
- 2 Operating modes
- 2.1 READ mode
- 2.2 WRITE mode
- 2.3 Data retention mode
- 3 Maximum ratings
- 4 DC and AC parameters
- 5 Package mechanical data
- 6 Part numbering
- 7 Environmental information
- 8 Revision history
Features
■ Integrated, ultra low power SRAM, power-fail control circuit, and battery ■ Conventional SRAM operation; unlimited WRITE cycles ■ 10 years of data retention in the absence of power ■ Battery internally isolated until power is first applied ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages: PFD = power-fail deselect voltage) –M 4 8 Z 1 2 8 : VCC = 4.75 to 5.5 V 4.5 V ≤ VPFD ≤ 4.75 V –M 4 8 Z 1 2 8 Y : VCC = 4.5 to 5.5 V 4.2 V ≤ VPFD ≤ 4.5 V –M 4 8 Z 1 2 8 V : VCC = 3.0 to 3.6 V 2.8 V ≤ VPFD ≤ 3.0 V (contact ST sales office for availability) ■ Pin and function compatible with JEDEC standard 128 K x 8 SRAMs ■ RoHS compliant – Lead-free second level interconnect PMDIP32 module (PM)
1 Description
Figure 1. Logic diagram Table 1. Signal names
2 Operating modes
Table 2. Operating modes Note: X = V IH or VIL; VSO = battery backup switchover voltage.
2.1 READ mode
hold time (tAXQX) but will go indeterminate until the next address access.
- See Table 10 on page 15 for details.
2.2 WRITE mode
by the earlier rising edge of W or E. the outputs tWLQZ after W falls. Figure 6. WRITE enable controlled, WRITE AC waveforms Note: Output enable (G ) = high. Figure 7. Chip enable controlled, WRITE AC waveforms Note: Output enable (G ) = high.
Table 4. WRITE mode AC characteristics
2.3 Data retention mode
source which preserves data. allow for processor stabilization. After tER, normal RAM operation can resume. For more information on battery storage life refer to the application note AN1012.
- If E goes low simultaneously with W going low, the outputs remain in the high impedance state.
2.4 V CC noise and negative going transients
is recommended in order to provide the needed filtering. is recommended for through hole and MBRS120T3 is recommended for surface-mount). Figure 8. Supply voltage protection
3 Maximum ratings
extended periods may affect device reliability. Table 5. Absolute maximum ratings
- Soldering temperature of the IC leads is to not exc eed 260 °C for 10 seconds. In order to protect the lithium
battery, preheat temperatures must be limited such that the battery temperature does not exceed +85 °C. Furthermore, the devices shall not be exposed to IR reflow.
4 DC and AC parameters
the measurement conditions when using the quoted parameters. Table 6. Operating and AC measurement conditions Note: Output Hi-Z is defined as the point where data is no longer driven. Figure 9. AC measurement load circuit Table 7. Capacitance
- Effective capacitance m easured with power supply at 5 V (M48Z128/Y) or 3.3 V (M48Z128V); sampled
Table 8. DC characteristics
Figure 10. Power down/up mode AC waveforms Table 9. Power down/up AC characteristics Table 10. Power down/up trip points DC characteristics
- V PFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring
until 200 µs after VCC passes VPFD (min).
- V PFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
- All voltages referenced to V SS.
5 Package mechanical data
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 11. PMDIP32 – 32-pin plastic DIP module, package outline Note: Drawing is not to scale. Table 11. PMDIP32 – 32-pin plastic DIP module, package mechanical data
6 Part numbering
Table 12. Ordering information scheme ST sales office nearest you.
- Contact local ST sales office for availability
7 Environmental information
Figure 12. Recycling symbols button cell battery fully encapsulated in the final product. and local/national disposal and recycling regulations. compliance statements and waste recycling. Go to www.st.com/nvram, then select "Lithium Battery Recycling" from "Related Topics".
8 Revision history
Table 13. Revision history all references from datasheet.