STMicroelectronics 74AC163TTR

Overview

74AC163TTR from STMicroelectronics is a high-speed CMOS synchronous presettable 4-bit binary counter with synchronous clear, operating from 2V to 6V supply. It delivers 200MHz max clock frequency (typ. at VCC = 5V), 24mA symmetrical output drive, and supports four functional modes: reset, parallel load, count-up, and hold. Used in digital timing control, address sequencing, and state machine counters in industrial logic systems.

For engineers reviewing the 74AC163TTR datasheet, 74AC163TTR pinout, 74AC163TTR application, or 74AC163TTR equivalent, key selection criteria include synchronous preset capability, 50Ω transmission line driving, balanced tPLH/tPHL propagation delays, and latch-up immunity for robust operation in noise-prone environments.

Technical Context

The 74AC163TTR implements a fully synchronous 4-bit binary counter with dedicated control inputs: CLEAR (asynchronous reset override), LOAD (parallel data capture on rising clock edge), PE and TE (dual count-enable logic). Its mode selection is determined by truth-table-defined priority: CLEAR > LOAD > PE/TE-enabled counting.

It features sub-micron C2MOS fabrication enabling low ICC (8µA max at 25°C), 2KV ESD protection on all I/O, and guaranteed incident-wave switching into 50Ω transmission lines. Output impedance symmetry (|IOH| = IOL ≥ 24mA) ensures clean signal integrity in bus-driven applications.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9–5.1 mm width, 6.25–6.5 mm length, 0.65 mm pitch, 0.5–0.7 mm lead length, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous counter applications.

Compared with SN74AC163N and 74LV163PW, the 74AC163TTR uniquely combines TSSOP packaging, 200MHz speed headroom, 50Ω line driving, and full 2–6V flexibility-making it optimal for space-constrained, noise-immune, high-throughput digital control applications.

Availability

74AC163TTR is available at Aetrix Electronics and suitable for industrial PLC timing modules, digital test equipment sequencers, communication protocol state machines, and legacy bus address generators requiring stable component supply and long-term manufacturability.

Supply support for 74AC163TTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74AC logic family targets high-speed, low-power, noise-immune TTL-compatible digital building blocks-optimized for industrial control, instrumentation, and legacy-system upgrades where reliability and timing precision are critical.

FAQ

Is the 74AC163TTR pin-compatible with standard 74LS163 devices?

Yes-74AC163TTR is pin- and function-compatible with 74LS163 and 74HC163. All control inputs (CLEAR, LOAD, PE, TE), clock, data (A–D), outputs (QA–QD), CARRY OUT, VCC, and GND occupy identical positions in the TSSOP-16 footprint. No PCB redesign is needed for drop-in replacement.

What is the minimum recommended bypass capacitance for stable operation?

A 100nF X7R ceramic capacitor placed within 3 mm of pins 8 (GND) and 16 (VCC) is mandatory. For systems with fast transient loads, add a 10µF tantalum or polymer capacitor in parallel to suppress low-frequency supply droop and maintain noise immunity across the 2–6V operating range.

Does the CARRY OUT signal require external pull-up or pull-down?

No-CARRY OUT is a fully buffered CMOS output capable of driving 24mA sink/source. It operates rail-to-rail and requires no external termination when interfacing with standard CMOS or TTL inputs. External pull-ups are only needed if driving open-drain or wired-OR configurations.

Can the 74AC163TTR operate reliably at 3.3V with 50Ω transmission line loads?

Yes-datasheet AC specs confirm guaranteed 50Ω line driving at VCC = 3.3V ±0.3V, with tPLH/tPHL ≤ 13.0 ns and fMAX ≥ 70 MHz. Output voltage levels (VOH ≥ 2.9V, VOL ≤ 0.5V at 12mA) meet 3.3V LVTTL thresholds, ensuring interoperability without level translation.