HEF4894B_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 12 July 2012 4 of 18
NXP Semiconductors
HEF4894B-Q100
12-stage shift-and-store register LED driver
5.2 Pin description
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; = LOW-to-HIGH clock transition; = HIGH-to-LOW clock transition;
Z = high-impedance OFF-state.
[2] Q10S = the data in register stage 10 before the LOW to HIGH clock transition.
[3] Q11S = the data in register stage 11 before the HIGH to LOW clock transition.
Table 2. Pin description
Symbol Pin Description
D 2 serial input
QP0 to QP11 4, 5, 6, 7, 8, 9, 18, 17, 16, 15, 14, 13 parallel output
QS1 11 serial output
QS2 12 serial output
CP 3 clock input
STR 1 strobe input
OE 19 output enable input
V
DD
20 supply voltage
V
SS
10 ground (0 V)
Table 3. Function table
[1]
At the positive clock edge the information in the 10
th
register stage is transferred to the 11
th
register stage and the QS output
Control Input Parallel output Serial output
CP OE STR D QP0 QPn QS1
[2]
QS2
[3]
L X X Z Z Q10S no change
L X X Z Z no change Q11S
H L X no change no change Q10S no change
HHLZQPn 1 Q10S no change
HHHL QPn1 Q10S no change
H H H no change no change no change Q11S
