Overview
The CD4532BE is a CMOS 8-bit priority encoder produced by Texas Instruments. This integrated circuit consists of combinational logic that encodes the highest priority input (D7-D0) to a 3-bit binary code. The device is designed to handle priority encoding, where each of the eight inputs has an assigned priority, with D7 being the highest and D0 the lowest. The encoder is inhibited when the chip-enable input EI is low, and when EI is high, the binary representation of the highest-priority input appears on output lines Q2-Q0. The group select line GS indicates the presence of priority inputs, and the enable-out (EO) line is high when no priority inputs are present.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | CD4532BE |
| Logic Family | CD4000 |
| Number of Bits | 8 bit |
| Number of Input Lines | 8 |
| Number of Output Lines | 4 |
| Operating Supply Voltage | 3 V to 18 V |
| Output Current | -4.2 mA ~ 4.2 mA |
| Maximum Clock Frequency | 8 MHz |
| Propagation Delay Time | 110 ns |
| Operating Temperature Range | -55°C to 125°C |
| Package Type | PDIP, SOIC, SOP, TSSOP |
| Pins | 16 |
| RoHS Compliance | Yes |
Key Features
- Converts from 1 of 8 to binary
- Provides cascading feature to handle any number of inputs
- Group select indicates one or more priority inputs
- Standardized, symmetrical output characteristics
- 100% tested for quiescent current at 20 V
- Maximum input current of 1 µA at 18 V over full package temperature range; 100 nA at 18 V and 25°C
- Noise margin: 0.5 V at VDD= 5 V, 1.5 V at VDD= 10 V and 15 V
- Meets all requirements of JEDEC Tentative Standard No. 13B, 'Standard Specifications for Description of 'B' Series CMOS Devices'
Applications
- Priority encoder
- Binary or BCD encoder (keyboard encoding)
- Floating point arithmetic
Q & A
- What is the primary function of the CD4532BE?
The CD4532BE is an 8-bit priority encoder that converts the highest priority input (D7-D0) to a 3-bit binary code.
- What is the operating supply voltage range for the CD4532BE?
The operating supply voltage range is from 3 V to 18 V.
- What is the maximum clock frequency of the CD4532BE?
The maximum clock frequency is 8 MHz.
- What is the propagation delay time of the CD4532BE?
The propagation delay time is 110 ns.
- What are the package options available for the CD4532BE?
The device is available in PDIP, SOIC, SOP, and TSSOP packages.
- Is the CD4532BE RoHS compliant?
- What is the operating temperature range of the CD4532BE?
The operating temperature range is from -55°C to 125°C.
- How does the group select line (GS) function in the CD4532BE?
The group select line GS is high to indicate that priority inputs are present.
- What is the purpose of the enable-out (EO) line in the CD4532BE?
The enable-out (EO) line is high when no priority inputs are present, and it goes low if any one input is high, disabling all cascaded lower-order stages.
- Can the CD4532BE be cascaded to handle more inputs?
