The HEFB is a BCD to 7-segment latch/decoder/driver for liquid crystal and LED displays. It has four address inputs (D0 to D3), an active. CMOS IC Use of: There is no english text yet available. Choose the german version instead. Operation: There is no english text yet available. Choose the. MCBCPG from ON SEMICONDUCTOR >> Specification: IC, CMOS, , DIP16, 15V.

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Billing information Customer number. Thank you Contact details. Yes, please send me SOS electronic Newsletter by e-mail x per month. Figures 6, 7and 8 show how to modify the above circuit to drive LED common-anode displays, gas discharge displays, and low-brightness fluorescent displays, respectively.

Valuable comments will be rewarded. If you are already our customer but you do not know coms login information request them. The 74LS47 has active-low outputs designed for driving a common-anode LED display via external current-limiting resistors Rxas shown in Figure 2. The not-BL pin 4 terminal is also normally tied high, but blanks turns off all seven segments when pulled low.

74HC4543 – BCD to 7-Seg LCD Latch Decoder Driver

Driving a gas discharge readout with cmoz B. Share it with us. More information about the product. Basic method of cascading B ICs without zero suppression. Driving a fluorescent readout with a B. Figure 15 shows the basic circuit connections to be used when cascading stages.


Some of these devices have integral ripple-blanking facilities, others have built-in data latches, and a few even have built-in decade counter stages, etc.

I want to register. The B is very easy to use, and has only three input control terminals; of these, the not-LT pin 3 dmos is normally tied high, but cmis on all seven segments of the display when pulled low. Figure 3 shows how to connect the ripple-blanking terminals to give leading zero suppression on the first three digits of a four-digit display.

Figure 1 shows the cmoss diagrams and pin designations of these devices, each of which is housed in a pin DIL package. If trailing-zero suppression is required, the direction of ripple-blanking feedback must be reversed with the RBI terminal of the LSD grounded and its RBO terminal wired to the RBI terminal of the next least-significant stage, and so on.

Driving a low-brightness fluorescent readout. If cascaded B ICs are required to give automatic leading-zero suppression, the basic Figure 17 circuit must be modified as shown in Figure 18 to provide ripple-blanking operation.

74HC – BCD to 7-Seg LCD Latch Decoder Driver

Series Using 7-Segment Displays All articles in this cmow By using our services you consent to the use of cookies.

Note in the cases of Figures 6 and 7 that an NPN buffer transistor must be interposed between each output drive segment and the input segment of the display.


Figure 14 shows the functional diagram and pin notations of the B. They have integral ripple-blanking facilities, but do not incorporate data latches. Finally, the LE latch enable terminal pin 5 enables the IC to give either direct or latched decoding operation. F ounded in Figure 4 shows the functional diagram and pin notations of the device, which can use any power source in the 5V to 15V range.

The segment output currents are internally limited to about 5mA at 10V or 10mA at 15V. C,os special two-part feature on how to use seven-segment alphanumeric displays. The B can be used to drive most popular types of seven-segment displays.

In Figure 12Rx sets the segment current of the display and Ry sets the base current of the transistor 10mA maximum. Figure 11 shows the basic way of using the B to drive a seven-segment LCD, and Figures 12 and 13 show it used to drive other types of seven-segment displays.

Driving a gas discharge readout. Way of using the B to drive a common-cathode or b common-anode seven-segment LED displays.