1. General description
The 74HC173; 74HCT173 is a quad positive-edge triggered D-type flip-flop. The device features
clock (CP), master reset (MR), two input enable (E1, E2) and two output enable (OE1, OE2) inputs.
When the input enables are LOW, the outputs Qn will assume the state of their corresponding Dn
inputs that meet the set-up and hold time requirements on the LOW-to-HIGH clock (CP) transition.
A HIGH on either input enable will cause the device to go into a hold mode, outputs hold their
previous state independently of clock and data inputs. A HIGH on MR forces the outputs LOW
independently of clock and data inputs. A HIGH on either output enable pin causes the outputs to
assume a high-impedance OFF-state. Operation of the output enable inputs does not affect the
state of the flip-flops. Inputs include clamp diodes. This enables the use of current limiting resistors
to interface inputs to voltages in excess of VCC.
2. Features and benefits
• Complies with JEDEC standard no. 7A
• Input levels:
• For 74HC173: CMOS level
• For 74HCT173: TTL level
• Gated input enable for hold (do nothing) mode
• Gated output enable control mode
• Edge-triggered D-type register
• Asynchronous master reset
• ESD protection:
• HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-A exceeds 200 V
• Specified from -40 °C to +85 °C and -40 °C to +125 °C