NTE2055 데이터 시트보기 (PDF) - NTE Electronics
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NTE2055 Datasheet PDF : 4 Pages
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Coded Condition
of MSD
+0
–0
+0 UR
–0 UR
+1
–1
+1 OR
–1 OR
Truth Table (DS1 =1)
Q3 Q2 Q1 Q0
1
1
1
0
1
0
1
0
1
1
1
1
1
0
1
1
0
1
0
0
0
0
0
0
0
1
1
1
0
0
1
1
BCD to 7 Segment
Decoding
Blank
Blank
Blank
Blank
4→1
0→1
Hook up
only seg b
7→1
3→1
and c to
MSD
Notes for Truth Table:
Q3 – 1/2 digit, low for “1”, high for “0”
Q2 – Polarity: “1” = positive, “0” = negative
Q0 – Out of range condition exists if Q0 =1. When used in conjunction with Q3 the type
of out of range condition is indicated, i.e., Q3 = 0 → OR or Q3 = 1 → UR.
When only segment b and c of the decoder are connected to the 1/2 digit of the display 4,
0, 7, and 3 appear as 1.
The overrange indication (Q3 = 0 and Q0 = 1) occurs when the count is greater than 1999,
e.g., 1.999V for a reference of 2V. The underrage indication, useful for autoranging circuits,
occurs when the count is less than 180, e.g., o.180V for a reference of 2V.
Caution: If the most significant digit is connected to a display other than a “1” only; such as
a full digit display, segments other than b and c must be disconnected. The BCD
ti seven decoder must blank on BCD inputs 1010 to 1111.
Pin Connection Diagram
VAG 1
Vref 2
VX 3
RI 4
RI/CI 5
CI 6
CO 1 7
CO 2 8
DU 9
CLK 1 10
24 VDD
23 Q3
22 Q2
21 Q1
20 Q0
19 DS 1
18 DS 2
17 DS 3
16 DS 4
15 OR
CLK 2 11
VEE 12
14 EOC
13 VSS
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