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The MM74HCT373 octal D-type latches and MM74HCT374 Octal D-type flip flops advanced silicon gate CMOS technology, which provides the inherent bene-fits of low power consumption and wide power supply range, but are LS-TTL input and output characteristic & pin-out compatible. The 3-STATE outputs are capable of driving 15 LS-TTL loads. All inputs are protected from dam-age due to static discharge by internal diodes to VCC and ground.
When the MM74HCT373 LATCH ENABLE input is HIGH,the Q outputs will follow the D inputs. When the LATCH ENABLE goes LOW, data at the D inputs will be retained at the outputs until LATCH ENABLE returns HIGH again.When a high logic level is applied to the OUTPUT CON- TROL input, all outputs go to a high impedance state,regardless of what signals are present at the other inputs and the state of the storage elements.
The MM74HCT374 are positive edge triggered flip-flops.Data at the D inputs, meeting the setup and hold time requirements, are transferred to the Q outputs on positive going transitions of the CLOCK (CK) input. When a high logic level is applied to the OUTPUT CONTROL (OC) input, all outputs go to a high impedance state, regardless of what signals are present at the other inputs and the state of the storage elements.
MM74HCT devices are intended to interface between TTL and NMOS components and standard CMOS devices.These parts are also plug in replacements for LS-TTL devices and can be used to reduce power consumption in existing designs.
MM74HCT374 Maximum Ratings
Supply Voltage (VCC ) -0.5V to+7.0V DC Input Voltage (VIN) -1.5 to Vcc + 1.5V DC Output Voltage (VOUT) -0.5 to Vcc + 0.5V Clamp Diode Current (IIK , IOK ) ±20 mA DC Output Current, per pin (IOUT ) ±35 mA DC VCC or GND Current, per pin (ICC) ±70 mA Storage Temperature Range (TSTG ) -65 to ,150 Power Dissipation (PD ) (Note 3) 600 mW S.O. Package only 500 mW Lead Temperature (TL) (Soldering 10 seconds) 260°C
MM74HCT374 Features
TTL input characteristic compatible Typical propagation delay: 20 ns Low input current: 1 A maximum Low quiescent current: 80 A maximum Compatible with bus-oriented systems Output drive capability: 15 LS-TTL loads