SN74LS85D ,4-BIT MAGNITUDE COMPARATOR
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SN74LS85D
4-BIT MAGNITUDE COMPARATOR
4-BIT MAGNITUDE
COMPARATORThe SN54/74LS85 is a 4-Bit Magnitude Camparator which compares two
4-bit words (A, B), each word having four Parallel Inputs (A0–A3, B0–B3); A3,
B3 being the most significant inputs. Operation is not restricted to binary
codes, the device will work with any monotonic code. Three Outputs are
provided: “A greater than B” (OA>B), “A less than B” (OA
(OA=B). Three Expander Inputs, IA>B, IAexternal gates. For proper compare operation, the Expander Inputs to the
least significant position must be connected as follows: IAB = L, IA=B
= H. For serial (ripple) expansion, the OA>B, OAconnected respectively to the IA>B, IAsignificant comparator, as shown in Figure 1. Refer to Applications section of
data sheet for high speed method of comparing large words.
The Truth Table on the following page describes the operation of the
SN54/74LS85 under all possible logic conditions. The upper 11 lines describe
the normal operation under all conditions that will occur in a single device or
in a series expansion scheme. The lower five lines describe the operation
under abnormal conditions on the cascading inputs. These conditions occur
when the parallel expansion technique is used. Easily Expandable Binary or BCD Comparison OA>B, OA< B, and OA=B Outputs Available
PIN NAMES LOADING (Note a)
A0–A3, B0–B3
IA=B
IAB
OA>B
OAOA=B
Parallel Inputs
A = B Expander Inputs
A < B, A > B, Expander Inputs
A Greater Than B Output (Note b)
B Greater Than A Output (Note b)
A Equal to B Output (Note b)
NOTES: 1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
Temperature Ranges.
