74HC257 IC – (SMD Package) – Quad 2-input multiplexer IC (74257 IC)
The 74HC257 is a quad 2-input multiplexer with 3-state outputs. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
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Description
The 74HC257 is a quad 2-input multiplexer with 3-state outputs. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
Features:-
? Non-inverting data path
? 3-state outputs interface directly with system bus
? Complies with JEDEC standard no. 7A
? Input levels:
– For 74HC257: CMOS level
– For 74HCT257: TTL level
? ESD protection:
– HBM JESD22-A114F exceeds 2000 V
– MM JESD22-A115-A exceeds 200 V
? Multiple package options
Specification:-
| Symbol | Parameter | Value | Units |
| VCC | Supply Voltage | ? 0.5 to + 7.0 | V |
| IIK | input clamping current | ?20 | mA |
| IOK | output clamping current | ?20 | mA |
| IO | output current | ?35 | mA |
| ICC | supply current | ?70 | mA |
Related Document:-
Additional information
Operating voltage | 2.5 3.0V |
Pixel Resolution | 0.3MP |
Photosensitive array | 640 x 480 |
Optical Size | 1.6 inch |
Angel of view | 67 degrees |
Maximum Frame Rate | 30fps VGA |
Sensitivity | 1.3V/(Lux-sec) |
Dormancy | Less than 20A |
Power consumption | 60mW/15fpsVGA YUV |
Temperature operation Range | -30 C ~ 70 C |
Pixel area | 3.6 x 3.6 m |
Signal to noise ratio (SNR) | 46 dB |
Dynamic range | 52 dB |
Specification
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