Philips Semiconductors
Product specification
20-bit bus-interface D-type flip-flop;
positive-edge trigger (3-State)
74ALVCH16821
FEATURES
•
Wide supply voltage range of 1.2V to 3.6V
•
Complies with JEDEC standard no. 8-1A
•
Current drive
±
24 mA at 3.0 V
•
CMOS low power consumption
•
Direct interface with TTL levels
•
MULTIBYTE
TM
flow-through standard pin-out architecture
•
Low inductance multiple V
CC
and ground pins for minimum noise
and ground bounce
DESCRIPTION
The 74ALVCH16821 has two 10-bit, edge triggered registers, with
each register coupled to a 3-State output buffer. The two sections of
each register are controlled independently by the clock (nCP) and
Output Enable (nOE) control gates.
Each 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.
When nOE is LOW, the data in the register appears at the outputs.
When nOE is HIGH, the outputs are in high impedance OFF state.
Operation of the nOE input does not affect the state of the flip-flops.
The 74ALVCH16821 has active bus hold circuitry which is provided
to hold unused or floating data inputs at a valid logic level. This
feature eliminates the need for external pull-up or pull-down
resistors.
•
All data inputs have bus hold
•
Output drive capability 50Ω transmission lines @ 85°C
QUICK REFERENCE DATA
SYMBOL
t
PHL
/t
PLH
C
I
C
PD
F
max
GND = 0V; T
amb
= 25°C; t
r
= t
f
≤
2.5ns
PARAMETER
Propagation delay
nCP to nQ
n
Input capacitance
Power dissipation capacitance per buffer
Maximum clock frequency
CONDITIONS
V
CC
= 2.5V, C
L
= 30pF
V
CC
= 3.3V, C
L
= 50pF
Outputs enabled
Outputs disabled
TYPICAL
2.6
2.5
5.0
33
17
250
350
UNIT
ns
pF
pF
MHz
V
I
= GND to V
CC1
V
CC
= 2.5V, C
L
= 30pF
V
CC
= 3.3V, C
L
= 50pF
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
mW):
P
D
= C
PD
×
V
CC2
×
f
i
+
S
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz; C
L
= output load capacitance in pF;
f
o
= output frequency in MHz; V
CC
= supply voltage in V;
S
(C
L
×
V
CC2
×
f
o
) = sum of outputs.
ORDERING INFORMATION
PACKAGES
56-Pin Plastic SSOP Type III
56-Pin Plastic TSSOP Type II
TEMPERATURE RANGE
–40°C to +85°C
–40°C to +85°C
OUTSIDE NORTH AMERICA
74ALVCH16821 DL
74ALVCH16821 DGG
NORTH AMERICA
ACH16821 DL
ACH16821 DGG
DWG NUMBER
SOT371-1
SOT364-1
1998 May 29
2
853-2066 19467
Philips Semiconductors
Product specification
20-bit bus-interface D-type flip-flop;
positive-edge trigger (3-State)
74ALVCH16821
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
DC supply voltage 2.5V range (for max. speed
performance @ 30 pF output load)
V
CC
DC supply voltage 3.3V range (for max. speed
performance @ 50 pF output load)
DC Input voltage range
DC output voltage range
Operating free-air temperature range
Input rise and fall times
V
CC
= 2.3 to 3.0V
V
CC
= 3.0 to 3.6V
CONDITIONS
MIN
2.3
3.0
0
0
–40
0
0
MAX
2.7
V
3.6
V
CC
V
CC
+85
20
10
V
V
°C
ns/V
UNIT
V
I
V
O
T
amb
t
r
, t
f
ABSOLUTE MAXIMUM RATINGS
In accordance with the Absolute Maximum Rating System (IEC 134)
Voltages are referenced to GND (ground = 0V)
SYMBOL
V
CC
I
IK
V
I
I
OK
V
O
I
O
I
GND
, I
CC
T
stg
P
TOT
PARAMETER
DC supply voltage
DC input diode current
DC in ut voltage
input
DC output diode current
DC output voltage
DC output source or sink current
DC V
CC
or GND current
Storage temperature range
Power dissipation per package
–plastic medium-shrink (SSOP)
–plastic thin-medium-shrink (TSSOP)
For temperature range: –40 to +125
°C
above +55°C derate linearly with 11.3 mW/K
above +55°C derate linearly with 8 mW/K
V
I
t0
For control pins
1
For data inputs
1
V
O
uV
CC
or V
O
t
0
Note 1
V
O
= 0 to V
CC
CONDITIONS
RATING
–0.5 to +4.6
–50
–0.5 to +4.6
–0.5 to V
CC
+0.5
"50
–0.5 to V
CC
+0.5
"50
"100
–65 to +150
850
600
V
mA
V
mA
mA
°C
mW
UNIT
V
mA
NOTE:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
1998 May 29
5
嵌入式系统
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