M48Z129Y_10 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 20
Technical content
Datasheet sections
- 1 Description
- 2 Operation 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 ■ Microprocessor power-on reset (reset valid even during battery backup mode) ■ Battery low pin - provides warning of battery end-of-life ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages PFD = power-fail deselect voltage): –M 4 8 Z 1 2 9 Y : VCC = 4.5 to 5.5 V 4.2 V ≤ VPFD ≤ 4.5 V (contact the ST sales office for availability) –M 4 8 Z 1 2 9 V : VCC = 3.0 to 3.6 V 2.7 V ≤ VPFD ≤ 3.0 V ■ Self-contained battery in the CAPHAT™ DIP package ■ 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 Operation modes
maintaining data until valid power is restored. Table 2. Operating modes
2.1 READ mode
for tAXQX (output data hold time) but will go indeterminate until the next address access. Figure 4. Address controlled, READ mode AC waveforms
- See Table 10 for details.
Figure 5. Chip enable or output enable controlled, READ mode AC waveforms Table 3. READ mode AC characteristics
2.2 WRITE mode
Figure 6. WRITE enable controlled, WRITE mode AC waveform Figure 7. Chip enable controlled, WRITE mode AC waveforms
Table 4. WRITE mode AC characteristics
2.3 Data retention mode
impedance and all inputs are treated as “Don’t care”. supply lines is recommended. SO, the battery is disconnected, and the power supply is switched to external VCC. Deselect continues for tREC after VCC reaches VPFD(max). For more information on battery storage life refer to the application note AN1012.
- CL = 5 pF (see Figure 9).
- 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
Figure 8) is recommended in order to provide the needed filtering. 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 testing load circuit Table 7. Capacitance
- Effective capacitance m easured with power supply at 5 V; sampled only, not 100% tested.
Table 8. DC characteristics
Figure 10. Power down/up mode AC waveforms Table 9. Power down/up AC 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
- V PFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
Table 10. Power down/up trip points DC characteristics
- 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 module DIP, package outline Note: Drawing is not to scale. Table 11. PMDIP32 – 32-pin plastic DIP, package mechanical data
6 Part numbering
Table 12. Ordering information scheme ST sales office nearest you.
- Contact local ST sales office.
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. Document revision history Section 5; reformatted document.