(Singapore)
Product Summary
The MC54HC257 is an 8-input data selector/multiplexer with 3-state outputs. It is identical in pinout to the LS251. The MC54HC257 inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. The MC54HC257 selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be a low level for the selected data to appear at the outputs. If Output Enable is high, both the Y and the Y outputs are in the high–impedance state. This 3–state feature allows the HC251 to be used in bus–oriented systems.
Parametrics
MC54HC257 absolute maximum ratings: (1)VCC DC Supply Voltage: -0.5V to 7.0V; (2)Vin DC Input Voltage: -1.5V to VCC+1.5V; (3)Vout DC Output Voltage: -0.5V to VCC+0.5V; (4)Iin DC input Current, per pin: ±25mA; (5)Iout DC output Current, per pin: ±50mA; (6)ICC DC Supply Current, VCC and GND Pins: ±75mA; (7)PD Power Dissipation: 750mW; (8)Storage Temperature: -65℃ to 150℃; (9)Lead Temperature: 260℃.
Features
MC54HC257 features: (1)Output Drive Capability: 10 LSTTL Loads; (2)Outputs Directly Interface to CMOS, NMOS, and TTL; (3)Operating Voltage Range: 2V to 6V; (4)Low Input Current: 1μA; (5)High Noise Immunity Characteristic of CMOS Devices; (6)In Compliance with the Requirements Defined by JEDEC Standard No. 7A; (7)Chip Complexity: 134 FETs or 33.5 Equivalent Gates.
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