Homemade CMOS Integrated Circuit Tester CMOS INTEGRATED CIRCUIT TESTER
Author: Sun Peisheng
Electronic control circuit of electronic technology often uses a CMOS logic control system. Through years of maintenance practice, we design and install a simple integrated logic gate circuit tester. As long as you have the logical relationship of various logical gate circuit inputs and output, you can quickly judge the integrated circuit.
I. Conformity and principle of tester circuit
1. Circuit constitutes the tester circuit consists of + 12V DC power, 16 small bean switches, 15 light-emitting diodes, 15 ordinary carbon film resistors (1kωo.25w) and a 16-pin integrated circuit holder. In order to facilitate test judgment and analysis, for the 14-pin integrated circuit, switch k1 and the light emitting diode D1 corresponding to the control integrated block, the switch k2 and the light emitting diode D2 correspond to the 2 foot of the integrated block, so that the switch k13 and the light emitting diode D13 corresponds to the pin foot of the integrated block, which is generally 7 foot. From K7 control selection, K14 must closely control the foot link + 12V power supply, and see the internal ID in the picture for the integrated circuit pin number of the test 14 pin. Be sure to insert with the integrated block pin. For the 16-pin integrated circuit, the switch K1 and the light emitting diode D1 correspond to the 1 foot of the control integrated block, the switch k2 and the light emitting diode D2 correspond to the 2 foot of the integrated block, and push to the 7th foot (switch k7 is placed in a + 12V power position) 6 feet are grounded, from the switches K9 ', K10', K11 ', K12', K13 ', K14', K15 ', K14, respectively control the input and control LEDs D9, D10' from the foot to D16 ', respectively. Instructions, select the + 12V power supply according to various integrated blocks.
2. Basic test principle The integrated logic gate circuit is high or low may be selected by the switch K, when the input is high, the corresponding switch is in-time; the input level is low when the corresponding switch is broken. , When the logical output level corresponding to each group is high. The corresponding light-emitting diode is lit: When the output level is low, the light emitting diode does not emit light. It can be judged and analyzed by determining and analyzing the output level change and the actual logic calculation level relationship with different input levels. To make this tester, there are two points to pay attention to: (1) Ground conversion between the integrated circuit of the integrated circuit and the 8th foot of the foot must be considered. (2) The last foot pin of the integrated circuit does not have a positive terminal, and it is necessary to increase the switch K14 isolation. For example: 16 foots of CD1413 do not pick up the power supply.
Second, the test example produces the integrated circuit of each model into a card, and turn on the corresponding switch K according to the corresponding pin of the card, together with the power switch K0.
1. Test CC4011. The card is combined with the K14 (plus power), and the K7 is placed in the ground position as shown in Figure 2. This is measured to be 2 input four and non-hairs, turn the K1, K2 switch, and 3 foot output low.
D3 is not bright, D1, D2 bright. If KL, K2 is disconnected, the corresponding output 3 foot output is high, D3 bright, D1 ,. D2 is not bright. Only when the K1, K2 is turned on, D1, D2 has a bright, 3 feet also output low level, and the light emitting diode D3 is not bright. This is also the case with other doors. No more narrative. .
2. Test the CC4001. The card will be added to the power supply in the K14, and the K7 is set to the ground position. When K12, K13 is not turned on, the corresponding output terminal is high, D11 is bright, as long as K12, K13 is closed, the 11 foot output low, D11 is not bright, K12, K13 all together, Then, the 11 pin outputs low, D11 is not bright. This is also the case with other doors.
3. Measure the CC4071 card, together with the K14 (power). K7 position position is first measured. When K12, K13 is not turned on, the corresponding output 11 pin outputs low level, D11 is not bright, as long as K12, K13 incorporates one, D13, D12 has a corresponding light-emitting diode bright, then 11 pin output high level , D11 is bright, K12, K13 is all together. D13, D12 is bright, then the foot outputs high, D1L is bright. This is also the case with other doors.
4. Measure the CC4069 card, together with the K14 (power), and k7 place position position as shown in Figure 5. When the K1 is closed. DL light emitting diode is bright, 2 foot output low, D2 is not bright. When K1 is disconnected, the 2 foot outputs high, D2 is on. This is also the case with other doors.
5. Test the CC4081. The card is shown in Figure 6 This integrated circuit is 2 input four and the door.
When measured, the K14 is plugged into the power supply. K7 placement location. Light of K1, K2 switch, DL, D2 light emitting two tube, output terminal 3 foot outputs high level, and the light emitting diode D3 is lit.
If KL, K2 is disconnected, then the 3 foot outputs low, D1 is not bright, only the KL, K2, DL, D2 has a light-emitting diode bright, 8 feet also output low, DL is not bright. This is also the case with other doors.
6. Test CC4072. The card is shown in Figure 7. This integrated circuit is 4 input double or doors.
The K14 is closed (power) to place the K14 when measuring. As long as the input 2, 3, 4, 5 has a high level (K2, K3, K4, K5 feet has a turn-on or full-end, D2, D3, D4, D5 have a light-emitting diode or full bright ), 1 foot output high.
LED DL bright, K2, K3, K4, K5 is fully disconnected, 1 foot output low. DL is not bright. Note: Another or i-] test is also the case.
7. Test the CDL413, the card is shown in Figure 8CDL413 is 16 foot integrated circuits, and the k9 'is incorporated to the integrated block (D9 bright), and the KL is placed in the + 12V power supply position (DL bright), indicating that the road is non-door. normal. This method can be used in turn to measure whether other 6-way non-door is normal. The bucket PC2002 series produced by NEC is exactly the same as the CDL413 function and the pipeline arrangement.
8. Test / VICL4043 card, as shown in Figure 9MCL4043 is a 16-pin integrated circuit (which is directly grounded therefrom), and the K7 is converted into a high level. Turn the E5 (D5 bright), 4 foot input low (k4 disconnected), 3 foot input high (k3 on, D3 bright), then 2 foot output low, D2 is not bright, 4 foot input high (K4 on, D4 bright), 3 foot input low (K3 disconnected), then 2 foot output high, D2 bright, 4 foot input high (K4 Turn on, D4 Bright), 3 foot inputs high (K3 Turn on, D3 bright), 2 foot output high, D2 bright, other door measurements are also the same. 9. Measure the MC14066, the card is first incorporated (power supply), and the K7 is placed in the position position when measured in Figure 10.
The control terminal 5 is high (K5 on), the D5 light emitting diode is lit, 4 foot contact high (K4 on), D4 bright, then 3 pin output high (D3 bright).
K4 is not connected, D4 is not bright, D3 is not bright. Turn the K3 (D3 bright), K4 is disconnected, and D4 is on. 3, 4 foots are input, output. The control terminal K5 is disconnected, the D5 is not bright, 3, 4 foots, no matter which end is higher, the other end is low.
Third, the small junction of this tester can measure the integrated circuits such as MC, CD, CC, HEF. There are also many integrated circuits that can also be tested in this tester. Such as: CD4541, CD40175, CD4023, CD4025, CD4002, CD4012, CI) 4073, CD4082, CD4013, 4 N25, 2G03D, and the like. (Note: CC, CD, MC, HEF and other series of general, direct substitution).
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