SN54LVTH162374中文资料具有三态输出的 3.3V ABT 16 位边沿 D 类触发器数据手册TI规格书

特性 Features

·Members of the Texas Instruments Widebus™Family
·Output Ports Have Equivalent 22- Series Resistors, So No External Resistors Are Required
·Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
·Support Unregulated Battery Operation Down to 2.7 V
·Typical VOLP (Output Ground Bounce) CC = 3.3 V, TA = 25°C
·Ioff and Power-Up 3-State Support Hot Insertion
·Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
·Distributed VCC and GND Pins Minimize High-Speed Switching Noise
·Flow-Through Architecture Optimizes PCB Layout
·Latch-Up Performance Exceeds 500 mA Per JESD 17
·ESD Protection Exceeds JESD 22·2000-V Human-Body Model (A114-A)
·200-V Machine Model (A115-A)

Widebus is a trademark of Texas Instruments.DESCRIPTION/ORDERING INFORMATION The 'LVTH162374 devices are 16-bit edge-triggered D-type flip-flops with 3-state outputs designed for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. These devices can be used as two 8-bit flip-flops or one 16-bit flip-flop. On the positive transition of the clock (CLK), the Q outputs of the flip-flop take on the logic levels set up at the D inputs. A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and the increased drive provide the capability to drive bus lines without need for interface or pullup components. OE does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The outputs, which are designed to source or sink up to 12 mA, include equivalent 22- series resistors to reduce overshoot and undershoot. Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.