Philips Semiconductors
Product specification
10-bit D-type flip-flop; positive-edge trigger
(3-State)
74ABT821
extra data width for wider data/address paths of buses carrying
parity.
FEATURES
• High speed parallel registers with positive edge-triggered D-type
flip-flops
The 74ABT821 is a buffered 10-bit wide version of the
74ABT374/74ABT534 functions.
• Ideal where high speed, light loading, or increased fan-in are
required with MOS microprocessors
The 74ABT821 is a 10-bit, edge triggered register coupled to ten
3-State output buffers. The two sections of the device are controlled
independently by the clock (CP) and Output Enable (OE) control
gates.
• Output capability: +64mA/–32mA
• Latch-up protection exceeds 500mA per Jedec Std 17
• ESD protection exceeds 2000 V per MIL STD 883 Method 3015
The register is fully edge triggered. The state of each D input, one
set-up time before the Low-to-High clock transition is transferred to
the corresponding flip-flop’s Q output.
and 200 V per Machine Model
• Power-up 3-State
• Power-up Reset
The 3-State output buffers are designed to drive heavily loaded
3-State buses, MOS memories, or MOS microprocessors.
DESCRIPTION
The active Low Output Enable (OE) controls all ten 3-State buffers
independent of the register operation. When OE is Low, the data in
the register appears at the outputs. When OE is High, the outputs
are in high impedance ”off” state, which means they will neither drive
nor load the bus.
The 74ABT821 high-performance BiCMOS device combines low
static and dynamic power dissipation with high speed and high
output drive.
The 74ABT821 Bus interface Register is designed to eliminate the
extra packages required to buffer existing registers and provide
QUICK REFERENCE DATA
CONDITIONS
= 25°C; GND = 0V
SYMBOL
PARAMETER
TYPICAL
UNIT
T
amb
t
t
Propagation delay
CP to Qn
PLH
PHL
C = 50pF; V = 5V
4.6
ns
L
CC
C
Input capacitance
Output capacitance
Total supply current
V = 0V or V
CC
4
7
pF
pF
nA
IN
I
C
Outputs disabled; V = 0V or V
O CC
OUT
CCZ
I
Outputs disabled; V =5.5V
500
CC
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
NORTH AMERICA
74ABT821 N
DWG NUMBER
SOT222-1
24-Pin Plastic DIP
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
74ABT821 N
74ABT821 D
74ABT821 DB
74ABT821 PW
24-Pin plastic SO
74ABT821 D
SOT137-1
24-Pin Plastic SSOP Type II
24-Pin Plastic TSSOP Type I
74ABT821 DB
74ABT821PW DH
SOT340-1
SOT355-1
PIN CONFIGURATION
PIN DESCRIPTION
PIN NUMBER
SYMBOL
FUNCTION
24
Output enable input
(active-Low)
OE
D0
D1
D2
D3
D4
D5
D6
D7
1
2
3
4
5
6
7
8
9
V
CC
1
OE
23 Q0
22 Q1
21 Q2
20 Q3
19 Q4
18 Q5
17 Q6
16 Q7
2, 3, 4, 5, 6,
7, 8, 9, 10, 11
D0-D9
Q0-Q9
Data inputs
23, 22, 21, 20, 19,
18, 17, 16, 15, 14
Data outputs
Clock pulse input (active
rising edge)
TOP VIEW
13
CP
10
20
GND
Ground (0V)
V
CC
Positive supply voltage
D8 10
D9 11
15
14
13
Q8
Q9
CP
GND 12
SA00223
1
1995 Sep 06
853-1616 15703