74AHCT244APW数据手册集成电路（IC）的缓冲器驱动器接收器收发器规格书PDF

描述 Description

The 74AHCT244A is an 8-bit buffer/line driver with 3-state outputs and TTL inputs. The device features two output enables (1OE and 2OE). A HIGH on nOE causes the associated outputs to assume a high-impedance OFF-state.
Designed to operate over a VCC range from 4.5 V to 5.5 V, the inputs are TTL compatible, which allows the device to be used to translate from 3.3 V to 5 V
Schmitt-trigger action at all inputs makes the circuit tolerant of slower input rise and fall times.
This device is fully specified for partial Power-down applications using IOFF. The IOFF circuitry disables the output, preventing the damaging backflow current through the device when it is powered down.

特性 Features

• Direct interface with TTL levels
• Supply voltage range from 4.5 V to 5.5 V
• Typical tpd of 2.8 ns at 5 V
• Typical VOL(p)< 0.8 V at VCC = 5 V, Tamb = 25 °C
• Typical VOH(v)> 2.3 V at VCC = 5 V, Tamb = 25 °C
• Supports mixed-mode voltage operation on all ports
• IOFF circuitry provides partial Power-down mode operation
• Latch-up performance exceeds 250 mA per JESD 78 Class II
• ESD protection:
• HBM ANSI/ESDA/JEDEC JS-001 Class 2 exceeds 3 kV
• MM JESD22-A115-A exceeds 150 V
• CDM JESD22-C101E exceeds 2 kV

• Specified from —40 °C to +85 °C and from —40 °C to +125 °C