5. TC74HC373P
The TC74HC373 is a high speed CMOS OCTAL LATCH with 3-STATE OUTPUT fabricated with
2
silicon gate CMOS technology.
This IC achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS
low power dissipation.
These 8-bit D-type latches are controlled by a latch enable input (LE) and a output enable input (OE).
While the LE input is held in high level, the Q outputs will follow the data input precisely or inversely.
When the LE is take low, the Q outputs will be latched precisely or inversely at the logic level of D
input data.
While the OE input is at low level, the eight outputs will be in a normal logic state (high or low logic
level) and while high level the outputs will be in a high impedance state.
An application designer has a choice of combination of inverting and non-inverting outputs, symmetri-
cal and neighbouring input/output pin layout.
The three-state output configuration and the wide choise of outline will make the busorganized sys-
tem simple.
All inputs are equipped with protection circuits against static discharge or transient excess voltage.
OE 1
20 VCC
Q0 2
19 Q7
D0 3
18 D7
D1 4
17 D6
Q1 5
16 Q6
Q2 6
15 Q5
D2 7
14 D5
D3 8
13 D4
Q3 9
12 Q4
GND 1011 LE
5-11. Error code
Error CodeMeaningAction
E01Mode Switch position changed before finali-Return the Mode Switch to its original
zation.setting and finalize the operation.
E08Registration without entering a clerk numberEnter a clerk number..
This error appears only when the clerk con-
trol function is activated.
E31Finalization of a transaction attempted with-Press the ST key.
out confirming the subtotal.
E33Finalize operation attempted without enter-Enter the amount tendered.
ing amount tendered.
E38READ/RESET operation without declaringPerform money declaration.
cash in drawer. This error appears only
when this function is activated.
E94Printer error.Turn the power off, and remove jammed
paper from the printer.
N 20 N |
ACEC
