M48Z02_07 STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 20
Technical content
Datasheet sections
- 1 Summary
- 2 Operation modes
- 2.1 Read mode
- 2.2 Write mode
- 2.3 Data retention mode
- 3 Maximum rating
- 4 DC and AC parameters
- 5 Package mechanical data
- 6 Part numbering
- 7 Revision history
Features
■ Integrated, ultra low power SRAM and power- fail control circuit ■ Unlimited WRITE cycles ■ READ cycle time equals WRITE cycle time ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages PFD = Power-fail deselect voltage): –M 4 8 Z 0 2 : VCC = 4.75 to 5.5V; 4.5V ≤ VPFD ≤ 4.75V –M 4 8 Z 1 2 : VCC = 4.5 to 5.5V; 4.2V ≤ VPFD ≤ 4.5V ■ Self-contained battery in the CAPHAT™ DIP package ■ Pin and function compatible with JEDEC standard 2K x 8 SRAMs ■ RoHS compliant – Lead-free second level interconnect PCDIP24 (PC) battery CAPHAT™
1 Summary
functional compatible with the DS1220. life lithium button cell to form a highly integrated battery backed-up memory solution. over commercial operating temperature range. the number of WRITEs that can be performed. Figure 1. Logic diagram Table 1. Signal names
2 Operation modes
Table 2. Operating modes IH or VIL; VSO = Battery back-up switchover voltage.
2.1 Read mode
Enable Access time (tELQV) or Output Enable Access time (tGLQV). for Output Data Hold time (tAXQX) but will go indeterminate until the next Address Access.
- See Table 10 on page 16 for details.
Figure 4. Read mode AC waveforms Note: WRITE Enable (W ) = High. Table 3. Read mode AC characteristics
2.2 Write mode
and G, a low on W will disable the outputs tWLQZ after W falls.
Table 4. Write mode AC characteristics
2.3 Data retention mode
of the power supply lines is recommended. on page 11 illustrates how a BOK check routine could be structured. For more information on a Battery Storage Life refer to the Application Note AN1012.
Figure 7. Checking the BOK flag status
2.4 V CC noise and negative going transients
Figure 8 on page 12) is recommended in order to provide the needed filtering. CC to VSS (cathode connected to VCC, anode to VSS). recommended for surface mount.
Figure 8. Supply voltage protection
3 Maximum rating
Program and other relevant quality documents. Table 5. Absolute maximum ratings
- Soldering temperature not to exceed 260°C for 10 se conds (total thermal budget not to exceed 150°C for
4 DC and AC 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 measured with power supply at 5V. Sampled only, not 100% tested.
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 200µs 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
conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 11. PCDIP24 – 24-pin plastic DIP, battery CAPHAT™, package outline Note: Drawing is not to scale. Table 11. PCDIP24 – 24-pin plastic DIP, battery CAPHAT™, package mechanical
6 Part numbering
Table 12. Ordering information scheme of this device, please contact the ST sales office nearest you.
7 Revision history
Table 13. Document revision history