9397 750 13276 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 11 May 2004 6 of 20
Philips Semiconductors
74LVC821A
10-bit D-type flip-flop with 5 V tolerant inputs/outputs
7. Functional description
[1] H = HIGH voltage level;
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition;
L = LOW voltage level;
l = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition;
Z = high-impedance OFF-state;
l = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition;
NC = no change;
X = don’t care.
8. Limiting values
GND 12 ground (0 V)
CP 13 clock input (LOW-to-HIGH, edge-triggered)
Q9 14 3-state flip-flop output
Q8 15 3-state flip-flop output
Q7 16 3-state flip-flop output
Q6 17 3-state flip-flop output
Q5 18 3-state flip-flop output
Q4 19 3-state flip-flop output
Q3 20 3-state flip-flop output
Q2 21 3-state flip-flop output
Q1 22 3-state flip-flop output
Q0 23 3-state flip-flop output
V
CC
24 supply voltage
Table 3: Pin description
…continued
Symbol Pin Description
Table 4: Function table
[1]
Operating mode Input Internal
flip-flops
Output
OE CP Dn Qn
Load and read register L ↑ ILL
L ↑ hHH
Load register and disable outputs H ↑ ILZ
H ↑ hHZ
Hold L H or L X NC NC
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
V
CC
supply voltage −0.5 +6.5 V
I
IK
input diode current V
I
<0 V - −50 mA
V
I
input voltage
[1]
−0.5 +6.5 V
I
OK
output diode current V
O
>V
CC
or V
O
<0 V - ±50 mA
