Renesas ICM7211AMIPL

Overview

ICM7211AMIPL from Intersil is a non-multiplexed 4-digit, 7-segment LCD display decoder-driver IC with integrated RC oscillator, backplane driver, and 28 segment outputs. It operates from 3V to 6V, draws as low as 10µA (typ) in blank mode, and delivers 150Hz backplane frequency at 5V - designed for microprocessor-controlled alphanumeric displays in industrial instrumentation and embedded front panels.

For engineers reviewing the ICM7211AMIPL datasheet, ICM7211AMIPL pinout, ICM7211AMIPL application, or ICM7211AMIPL equivalent, this device offers direct microprocessor interface via Chip Select–controlled latches, Code B decoding (0–9, dash, E, H, L, P, blank), and synchronized multi-device backplane chaining - critical for cost-sensitive, low-power LCD systems requiring minimal CPU overhead.

Technical Context

The ICM7211AMIPL implements a self-timed architecture with an internal 19kHz free-running RC oscillator divided by 128 to generate a precise 150Hz backplane signal. Its four independent 7-segment output drivers are CMOS-based with matched N/P channel ratios to eliminate DC bias and maximize LCD lifetime.

It uses dual Chip Select inputs (CS1/CS2) to latch 4-bit binary data (B0–B3) and 2-bit digit address (DA1/DA2) on simultaneous low assertion, then decodes and updates selected digit output latches on either CS rising edge - enabling high-speed, non-blocking display updates without ROM-intensive software decoding.

Key Specifications

Pinout & Package

ICM7211AMIPL is housed in a 40-lead PDIP package (E40.6), through-hole compatible, rated for -40°C to +85°C operation. Pin assignments are validated per Intersil FN3158 Rev 8.00, Page 2 (PDIP top view).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD display driver applications.

Compared with ICM7211AMIPL, the ICM7211AMIPLZ offers identical functionality with Pb-free processing, while the MAX7219CNG+ serves a different display technology and interface paradigm - making it unsuitable as a drop-in replacement but viable only for greenfield LED-based redesigns.

Availability

ICM7211AMIPL is available at Aetrix Electronics and suitable for industrial panel meters, embedded instrumentation, and portable test equipment requiring stable component supply, long-lifecycle support, and legacy-compatible through-hole packaging.

Supply support for ICM7211AMIPL 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

Intersil Corporation is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with expertise in high-reliability industrial and infrastructure solutions.

The ICM7211AMIPL belongs to Intersil's legacy LCD display driver product line, engineered specifically for microprocessor-based alphanumeric front panels where low power, simplicity, and display longevity are primary design constraints.

FAQ

What is the function of the OSC pin (Pin 36) on the ICM7211AMIPL?

The OSC pin on the ICM7211AMIPL serves as the oscillator input for the internal RC timing circuit. When left floating or connected to a capacitor (e.g., 22pF–220pF) to VDD, it sets the free-running frequency at ~19kHz, which is divided by 128 to produce the 150Hz backplane signal. Grounding OSC disables the internal backplane driver, allowing external synchronization via the BP pin - a key feature for multi-device LCD systems. This behavior is confirmed in FN3158 Rev 8.00, Pages 3 and 6.

Does the ICM7211AMIPL support true BCD input, or only Code B?

The ICM7211AMIPL supports both: it natively decodes true 4-bit BCD (0000–1001) into standard seven-segment decimal digits, and also implements "Code B" decoding for extended characters (dash, E, H, L, P, blank). The datasheet explicitly states that B0–B3 accept true binary inputs and correctly decode BCD to decimal outputs - Table 1 on Page 7 confirms valid 0–9 patterns, and the Functional Block Diagram shows a 4-to-7 decoder with programmable logic. This dual capability is intrinsic to the ICM7211AMIPL design.

Can multiple ICM7211AMIPL devices be synchronized to a single backplane signal?

Yes - the ICM7211AMIPL supports master-slave synchronization via its BP (Pin 5) and OSC (Pin 36) pins. When OSC is grounded, the internal backplane driver is disabled, and the BP pin becomes an input that accepts an external 150Hz square wave. Multiple ICM7211AMIPL units can then share one master's BP output, enabling scalable 8-, 12-, or 16-digit displays. Each slave adds ~200pF load; the datasheet recommends external BP generation if more than four devices are chained - verified in FN3158 Rev 8.00, Page 6.

What is the maximum capacitive load the BP output of the ICM7211AMIPL can drive?

The BP output of the ICM7211AMIPL is specified to drive a backplane capacitance equivalent to a 16-character, half-inch LCD display - approximately 5000pF, as confirmed by the "Backplane Rise/Fall Time" test condition (CL = 5000pF) in the Electrical Specifications table (Page 3). The datasheet further notes that the BP driver handles loads up to this value with ≤1.5µs transition times, ensuring sufficient slew rate for reliable LCD contrast across temperature. Exceeding this load risks timing skew and reduced display legibility.

Is the ICM7211AMIPL pin-compatible with the ICM7211AMLPZ variant?

Yes - the ICM7211AMIPL and ICM7211AMIPLZ share identical 40-lead PDIP mechanical dimensions (E40.6), pin numbering, and electrical functionality. The sole difference is the termination finish: ICM7211AMIPLZ uses 100% matte tin for Pb-free compliance, while ICM7211AMIPL is SnPb. Both operate across -40°C to +85°C and exhibit identical thermal resistance (60°C/W). This compatibility is documented in the Ordering Information table on Page 1 of FN3158 Rev 8.00.