M40Z300

M40Z300 M40Z300W NVRAM CONTROLLER for up to EIGHT LPSRAM s s s s s s s s s s CONVERT LOW POWER SRAMs into NVRAMs PRECISION POWER MONITORING and POWER SWITCHING CIRCUITRY AUTOMATIC WRITE-PROTECTION when VCC is OUT-OF-TOLERANCE TWO INPUT DECODER ALLOWS CONTROL for up to 8 SRAMs (with 2 devices active in parallel) CHOICE of SUPPLY VOLTAGES and POWER-FAIL DESELECT VOLTAGES: – M40Z300: VCC = 4.5V to 5.5V THS = VSS 4.5V ≤ VPFD ≤ 4.75V THS = VOUT 4.2V ≤ V PFD ≤ 4.5V – M40Z300W: VCC = 3.0V to 3.6V THS = VSS 2.8V ≤ VPFD ≤ 3.0V VCC = 2.7V to 3.3V THS = VOUT 2.5 ≤ VPFD ≤ 2.7V RESET OUTPUT (RST) for POWER ON RESET LESS THAN 12ns CHIP ENABLE ACCESS PROPAGATION DELAY (for 5.0V device) PACKAGING INCLUDES a 28-LEAD SOIC and SNAPHAT® TOP, or a 16-LEAD SOIC (to be Ordered Separately) SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT TOP which CONTAINS the BATTERY BATTERY LOW PIN (BL) SNAPHAT (SH) Battery 16 28 1 1 SO16 (MQ) SOH28 (MH) Figure 1. Logic Diagram VCC B+(1) THS E B A M40Z300 M40Z300W VOUT BL E1CON E2CON E3CON E4CON RST DESCRIPTION The M40Z300/W NVRAM Controller is a self-contained device which converts a standard low-power SRAM into a non-volatile memory. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. VSS B–(1) NOTE: 1. For 16-pin SOIC package only. AI02242 March 2000 1/16 M40Z300, M40Z300W Figure 2A. SOIC28 Connections Figure 2B. SOIC16 Connections VOUT NC NC RST NC A NC B NC BL NC NC THS VSS 1 28 27 2 2...