Apr 5, 18, 3, 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. Driving a low-brightness fluorescent readout. Way of using the B to drive a seven-segment LCD. Mar 30, 4. The common cathode goes to ground, the segments go to the outputs of the Shown above, is an example application of the 74LS48 7-seg decoder circuit.

Uploader: Zulugis
Date Added: 7 August 2013
File Size: 60.72 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 22816
Price: Free* [*Free Regsitration Required]

RBI pin turns off all output if the BCD value is zero all low used if the segment is a leading zero for hours, you don’t want Finally, the LE latch enable terminal pin 5 enables the IC to give either direct or latched decoding operation. Mar 31, 7.

The CO signal is a symmetrical square- wave at one-tenth of the CLK input frequency, and is useful in cascading B counters. A PWM pulse-width modulated signal can be applied to this pin to provided varying brightnesses to the LED display being driven, allowing user control of LED dimming for applications such as power saving by decreasing the brightness during times of low ambient light.

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.


You’ll also learn how to perform this task via immediate actions or via timers set displayy advance. The common cathode goes to ground, the segments go to the outputs of the Figure 5 shows the basic connections for driving a common-cathode LED display. The display can be blanked at any time by driving the BL terminal to the logic-1 level.

7448 BCD to seven segment display

Mar 31, 8. Jan 18, 1.

I’ve connected a to a common cathode seven segment display. Mar 31, Driving a gas discharge readout. The LT terminal drives all display outputs on when the terminal is driven to logic 0 with the RBO terminal open or at logic 1. This procedure is repeated on all except the LSD, which does not require zero suppression.

“BCD to 7-Segment” | Lampa Tronics

Need to brush up on your electronics principles? Driving a low-brightness fluorescent readout.

Enabling 7-segmwnt display can be connected directly to the outputs of the IC without the use of external current-limiting resistors. The IC does not incorporate a data latch and has no facility for ripple blanking.


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.

Mar 30, 4. Hello, Can you provide a schematic how you connected everything? To build a simple digital counter, consider using the decade counter.

Driving a gas discharge readout with a B. BCD to 7 segment display Posted by diamondking3 in forum: Driving a fluorescent readout with a B. Mar 30, 2. These multi-part series may be just what you need! Figure 1 shows the functional diagrams and pin designations of these devices, each of which is housed in a pin DIL package. All segments are extinguished when a low logical zero signal is applied to pin 4 OUT.

No, create an account now. Your name or email address: A current-limiting resistor Rx must be wired in series with each display segment and must have its value chosen to limit the segment current below 25mA.