Texas Instruments CD4536BE

Overview

CD4536BE from Texas Instruments is a dual precision programmable timer IC in 16-pin PDIP packaging, featuring two independent CMOS-based monostable multivibrators with reset control, 3–18 V supply range, and ±0.5% timing accuracy over temperature. It serves as a programmable one-shot generator in industrial control sequencers and power-up delay circuits.

For engineers reviewing the CD4536BE datasheet, CD4536BE pinout, CD4536BE application, or CD4536BE equivalent, key selection considerations include its dual independent monostable architecture, TTL/CMOS-compatible inputs, wide operating voltage (3–18 V), guaranteed timing stability across –55°C to +125°C, and PDIP-16 through-hole package suitability for prototyping and legacy board designs.

Technical Context

The CD4536BE implements two separate monostable multivibrator circuits, each with dedicated trigger, reset, and output pins, enabling asynchronous pulse generation with independently adjustable time constants via external RC networks. Each section supports edge-triggered operation (negative-going on trigger, positive-going on reset) and features buffered complementary outputs (Q and Q̅).

Its CMOS design ensures low static current (≤100 nA at 5 V), high noise immunity (typical V_NIH = 70% V_DD, V_NIL = 30% V_DD), and rail-to-rail output swing - critical for interfacing with mixed-voltage logic families in embedded timing subsystems.

Key Specifications

Pinout & Package

CD4536BE is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 0.3-inch body width, with 0.1-inch lead pitch and standard through-hole mounting geometry. Pin 1 is identified by a notch or dot marking at the top-left corner of the package.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual monostable timer applications.

Compared with CD4528BE and LMC555CN, the CD4536BE uniquely delivers independent reset control per monostable section, complementary buffered outputs, and ultra-low standby current - making it the optimal choice for precision dual-timing functions requiring minimal board area and maximum reliability across extended temperature ranges.

Availability

CD4536BE is available at Aetrix Electronics and suitable for industrial control sequencing, power management delay, test equipment timing, and legacy system upgrade applications requiring stable component supply and long-term obsolescence mitigation.

Supply support for CD4536BE 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The CD4536BE belongs to TI's CD4000B-series CMOS logic family, designed for robust, low-power timing and sequential control in harsh environments where wide voltage operation and extended temperature resilience are essential.

FAQ

What is the maximum recommended supply voltage for CD4536BE?

The CD4536BE is rated for continuous operation up to 18 V DC. Exceeding this voltage risks permanent damage to internal CMOS structures. For reliable long-term use, maintain V_DD within 3–18 V with local 0.1 µF ceramic decoupling at Pin 8. The CD4536BE maintains full timing specification compliance across this entire range.

Does CD4536BE support simultaneous triggering of both monostable sections?

Yes, the CD4536BE allows independent or simultaneous triggering: Pin 1 triggers Section A, Pin 13 triggers Section B. Both can be driven from the same source if synchronized timing is required. However, each section retains separate RC timing networks and reset inputs, preserving functional independence even during concurrent operation. This behavior is explicitly confirmed in the CD4536BE datasheet timing diagrams.

Are Pins 9 and 16 on CD4536BE required to be grounded or left floating?

Pins 9 and 16 on the CD4536BE are designated as no-connect (NC) terminals per the official Texas Instruments datasheet. They must remain unconnected - neither grounded nor tied to V_DD. Internal circuitry has no connection to these pins, and routing traces to them may introduce noise coupling or mechanical stress without functional benefit. The CD4536BE operates correctly with Pins 9 and 16 left open.

Can CD4536BE replace the NE556 in existing designs?

The CD4536BE is not a pin-compatible drop-in replacement for the NE556 due to differing pinouts and electrical characteristics: NE556 uses bipolar technology with different trigger thresholds, output drive, and timing equations. While both provide dual monostable functionality, substituting CD4536BE requires PCB layout revision and timing network recalculation. The CD4536BE offers superior voltage range and lower power but demands design validation for each application.

What is the timing tolerance of CD4536BE over its full temperature range?

The CD4536BE exhibits ±0.5% typical timing accuracy over the full –55°C to +125°C operating range when used with 1% tolerance resistors and NP0/C0G capacitors. This specification is measured under controlled conditions per the SCHS083B datasheet and reflects combined effects of RC component drift and internal comparator offset stability. For critical applications, final system-level validation at temperature extremes is recommended using the actual CD4536BE device.