54AC16953, 54ACT16953
74AC16953, 74ACT16953
16-BIT TRANSCEIVERS WITH 3-STATE OUTPUTS
SCAS412 - JUNE 1990

features

• Members of Texas Instruments Widebus^TM Family
• Packaged in Shrink Small-Outline 300-mil Packages (SSOP) and 380-mil Fine-Pitch Ceramic Flat Packages Using 25-mil Center-to-Center Pin Spacings
• Inputs are TTL- or CMOS-Voltage Compatible
• 3-State Outputs Drive Bus Lines Directly
• Flow-Through Architecture Optimizes PCB Layout
• Distributed V_CC and GND Pin Configuration Minimizes High-Speed Switching Noise
• EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
• 500-mA Typical Latch-Up Immunity at 125°C

description

The 'AC16953 and 'ACT16953 are inverting 16-bit registered bus transceivers composed of two 8-bit transceiver sections with separate control signals.

Data flow in the A-to-B mode is controlled by output-enable (1 and 2), clock-enable (1 and 2), and clock (1CLKAB and 2CLKAB) inputs. When 1 (or 2) is high, data storage is inhibited and the registers retain their previous states. When 1 (or 2) is low, the inverse of the data present at the corresponding A inputs is stored in the device on a low-to-high transition of 1CLKAB (or 2CLKAB). If 1 (or 2) is also low, this stored data appears on the corresponding B outputs; if 1 (or 2) is high, the corresponding B outputs are in the high-impedance state. 1 (or 2) does not affect the operation of the internal registers. Previously stored data can be retained or new data can be entered while the outputs are in the high-impedance state.

Data flow from B to A is controlled by 1 and 2, 1 and 2, and 1CLKBA and 2CLKBA in a manner analogous to that described above for A-to-B data flow.

The 74AC16953 and 74ACT16953 are packaged in TI's shrink small-outline package (SSOP) with 25-mil center-to-center pin spacings. This package provides twice the I/O pin count and functionality of a standard small-outline package in the same printed-circuit-board area.

The 'AC16953 has CMOS-compatible input thresholds. The 'ACT16953 has TTL-compatible input thresholds.

The 54AC16953 and 54ACT16953 are characterized over the full military temperature range of -55°C to 125°C. The 74AC16953 and 74ACT16953 are characterized for operation from -40°C to 85°C.