DS1222
FEATURES
Provides bank switching for 16 banks of memory Bank switching is software-controlled by a pattern recognition sequence on four address inputs Automatically sets all 16 banks off on power-up Bank switching logic allows only one bank on at a time Custom recognition patterns are available to prevent unauthorized access Full ±10% operating range Low-power CMOS circuitry Can be used to expand the address range of microprocessors and decoders Optional 16-pin SOIC surface mount package
PIN ASSIGNMENT
CEI PFI AW AX AY AZ GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC CEO BS1 BS2 BS3 BS4 NC CEI NC PFI AW AX AY AZ GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC CEO NC BS1 BS2 BS3 NC BS4
DS1222 14-Pin DIP (300-mil) See Mech. Drawings Section
DS1222S 16-Pin SOIC (300-mil) See Mech. Drawings Section
PIN DESCRIPTION
AW-AZ
CEI CEO
NC BS1,BS2, BS3,BS4
VCC GND
- Address Inputs
- Chip Enable Input
- Chip Enable Output
- No Connection
- Bank Select Outputs
- Bank Select Outputs
- Power Fail...
