Overview
The CD74HC4511E is a BCD-to-7 segment latch/decoder/driver produced by Texas Instruments. This device is part of the high-speed CMOS logic family and is designed to convert BCD (Binary Coded Decimal) inputs into 7-segment display outputs. It features four address inputs (D0-D3), an active-low blanking (BL) input, a lamp-test (LT) input, and a latch-enable (LE) input. The LE input, when high, enables the latches to store the BCD inputs, while a low LE makes the outputs transparent to the BCD inputs.
The CD74HC4511E is available in various package types, including PDIP-16, SOIC-16, and TSSOP-16, making it versatile for different design requirements.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | - | 6 |
| VIH (High-level input voltage) | V | 2 | - | - |
| VIL (Low-level input voltage) | V | - | - | 0.8 |
| IOH (High level output current) | mA | -10 | - | - |
| IOL (Low level output current) | mA | - | - | 10 |
| ICC (Supply current) | μA | - | 80 | 160 |
| Ci (Input Capacitance) | pF | - | 10 | - |
| tW (Pulse duration, LE low) | ns | 14 | - | 20 |
| tsu (Setup time, BCD inputs before LE↑) | ns | 10 | - | 15 |
| th (Hold time, BCD inputs before LE↑) | ns | 3 | - | 3 |
Key Features
- Operates over a wide VCC range: 2 V to 6 V for 'HC4511 and 4.5 V to 5.5 V for CD74HCT4511.
- High-output sourcing capability: up to 7.5 mA at 4.5 V and up to 10 mA at 6 V.
- Input latches for BCD code storage.
- Lamp test and blanking capability.
- Balanced propagation delays and transition times.
- Significant power reduction compared to LSTTL logic ICs.
- High noise immunity and direct LSTTL input logic compatibility.
Applications
- BCD-to-7 segment display drivers in digital clocks, calculators, and other numeric display systems.
- Industrial control panels and instrumentation.
- Automotive and consumer electronics where numeric displays are required.
- Any application requiring the conversion of BCD codes to 7-segment display outputs).
Q & A
- What is the CD74HC4511E used for?
The CD74HC4511E is used to convert BCD (Binary Coded Decimal) inputs into 7-segment display outputs.
- What are the operating voltage ranges for the CD74HC4511E?
The operating voltage ranges are 2 V to 6 V for 'HC4511 and 4.5 V to 5.5 V for CD74HCT4511.
- What is the maximum output current sourcing capability of the CD74HC4511E?
The device can source up to 7.5 mA at 4.5 V and up to 10 mA at 6 V.
- Does the CD74HC4511E have input latches?
- What are the key features of the CD74HC4511E in terms of noise immunity and input compatibility?
The device has high noise immunity and direct LSTTL input logic compatibility.
- What are some common applications of the CD74HC4511E?
Common applications include digital clocks, calculators, industrial control panels, and automotive electronics.
- What package types are available for the CD74HC4511E?
The device is available in PDIP-16, SOIC-16, and TSSOP-16 packages.
- How do the LE, BL, and LT inputs function on the CD74HC4511E?
The LE input enables the latches when high, the BL input controls blanking, and the LT input is for lamp testing.
- What is the significance of the setup and hold times for the BCD inputs before LE↑?
The setup and hold times ensure proper latching of the BCD inputs before the LE input goes high.
- How does the CD74HC4511E reduce power consumption compared to LSTTL logic ICs?
The device significantly reduces power consumption due to its CMOS technology.
