Page 1
1
PS8090C 02/07/00
Product Description
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced in the Companys advanced 0.5 micron CMOS
technology, achieving industry leading speed.
The PI74ALVCH16721 is a 20-bit flip-flop with 3-state outputs
designed specifically for 2.3V to 3.6V VCC operation. The
PI74ALVCH16721 is designed with edge-triggered D-type flipflops with qualified clock storage. On the positive transition of
clock (CLK) input, the device provides true data at the Q outputs,
provided that the clock-enable (CLKEN) input is LOW. If CLKEN
is HIGH, no data is stored.
A buffered output-enable (OE) input can be used to place the
20 outputs in either a normal logic state (HIGH or LOW level) or
a high-impedance state. In the high-impedance state, the outputs
neither load nor drive the bus lines significantly. The high-impedance
state and increased drive provide the capacity to drive bus lines
without the need for interface or pullup components. OE does not
affect the internal operation of the flip-flops. Old data can be
retained or new data can be entered while the outputs are in the
high-impedance state.
To ensure the high-impedance state during power up or power
down, OE should be tied to VCC through a pullup resistor; the
minimum value of the resistor is determined by the current-sinking
capability of the driver.
The PI74ALVCH16721 data has Bus Hold which retains the
data inputs last state whenever the data input goes to highimpedance preventing floating inputs and eliminating the need
for pullup/down resistors.
Product Features
• PI74ALVCH16721 is designed for low voltage operation
• V
CC
= 2.3V to 3.6V
• Hysteresis on all inputs
• Typical V
OLP
(Output Ground Bounce)
< 0.8V at VCC = 3.3V, TA = 25°C
• Typical V
OHV
(Output VOH Undershoot)
< 2.0V at VCC = 3.3V, TA = 25°C
• Bus Hold retains last active bus state during 3-STATE,
eliminating the need for external pullup resistors
• Industrial operation at 40°C to +85°C
• Packages available:
56-pin 240 mil wide plastic TSSOP (A)
56-pin 300 mil wide plastic SSOP (V)
Logic Block Diagram
1
56
29
55
2
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
3.3V 20-Bit Flip-Flop
with 3-STATE Outputs
PI74ALVCH16721
Page 2
2
PS8090C 02/07/00
PI74ALVCH16721
3.3V 20-Bit Flip-Flop with 3-State Outputs
stupnIstuptuO
EONEKLCKLCxDxQ
LHXX Q
0
LL
↑
HH
LL
↑
LL
LL HroLXQ
0
HXXX Z
Pin Name Description
OE Output Enable Input (Active LOW)
CLKEN Clock Enable Input (Active LOW)
CLK Clock Input (Active HIGH)
Dx Data Inputs
Qx 3-State Outputs
GND Ground
V
CC
Power
Product Pin Description Truth Table
(1)
Product Pin Configuration
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Don't Care or Irrelevant
Z = High Impedance
↑ = LOW-to-HIGH Transition
1
OE
Q1
Q2
GND
Q3
Q4
VCC
Q5
Q6
Q7
GND
Q8
Q9
Q10
Q11
Q12
Q13
GND
Q14
Q15
Q16
VCC
Q17
Q18
GND
Q19
Q20
NC
CLK
D1
D2
GND
D3
D4
VCC
D5
D6
D7
GND
D8
D9
D10
D11
D12
D13
GND
D14
D15
D16
VCC
D17
D18
GND
D19
D20
CLKEN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
25
26
27
28
32
31
30
29
56-Pin
A,V
Page 3
PI74ALVCH16721
3.3V 20-Bit Flip-Flop with 3-State Outputs
3
PS8090C 02/07/00
Storage Temperature ........................................................... 65°C to +150°C
Ambient Temperature with Power Applied ........................ 40°C to +85°C
Input Voltage Range, V
IN
......................................................
0.5V to V
CC
+0.5V
Output Voltage Range, V
OUT
...............................................
0.5V to V
CC
+0.5V
DC Input Voltage .................................................................... 0.5V to +5.0V
DC Output Current ............................................................................ 100 mA
Power Dissipation .................................................................................. 1.0W
Note:
Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is
a stress rating only and functional operation of the device
at these or any other conditions above those indicated in
the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect reliability.
DC Electrical Characteristics (Over the Operating Range, T
A
= 40°C to +85°C, VCC = 3.3V ±10%)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
sretemaraPnoitpircseDsnoitidnoCtseT
)1(
.niM.pyT
)2(
.xaMstinU
V
CC
egatloVylppuS3.26.3
V
V
HI
)3(
egatloVHGIHtupnI
V
CC
V7.2otV3.2=7.1
V
CC
V6.3otV7.2=0.2
V
LI
)3(
egatloVWOLtupnI
V
CC
V7.2otV3.2=7.0
V
CC
V6.3otV7.2=8.0
V
NI
)3(
egatloVtupnI0V
CC
V
TUO
)3(
egatloVtuptuO0V
CC
V
HO
tuptuO
HGIH
egatloV
I
HO
001-= µ V,A
CC
=.xaMot.niMV
CC
2.0-
V
HI
I,V7.1=
HO
6-=V,Am
CC
=V3.20.2
V
HI
I,V7.1=
HO
21-=V,Am
CC
=V3.27.1
V
HI
I,V0.2=
HO
21-=V,Am
CC
=V7.22.2
V
HI
I,V0.2=
HO
21-=V,Am
CC
=V0.34.2
V
HI
I,V0.2=
HO
42-=V,Am
CC
=V0.30.2
V
LO
tuptuO
WOL
egatloV
I
LO
001= µ V,A
LI
=.xaMot.niM2.0
V
LI
I,V7.0=
LO
6=V,Am
CC
=V3.24.0
V
LI
I,V7.0=
LO
21=V,Am
CC
=V3.27.0
V
LI
I,V8.0=
LO
21=V,Am
CC
=V7.24.0
V
LI
I,V8.0=
LO
42=V,Am
CC
=V0.355.0
I
HO
)3(
tuptuO
HGIH
tnerruC
V
CC
V3.2=21-
Am
V
CC
V7.2=21-
V
CC
V0.3=42-
I
LO
)3(
tuptuO
WOL
tnerruC
V
CC
V3.2=21
V
CC
V7.2=21
V
CC
V0.3=42
Page 4
4
PS8090C 02/07/00
PI74ALVCH16721
3.3V 20-Bit Flip-Flop with 3-State Outputs
Notes:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 3.3V, +25°C ambient and maximum loading.
3. Unused Control Inputs must be held HIGH or LOW to prevent them from floating.
DC Electrical Characteristics-Continued (Over the Operating Range, T
A
= 40°C to +85°C, VCC = 3.3V ±10%)
sretemaraPnoitpircseDsnoitidnoCtseT
)1(
.niM.pyT
)2(
.xaMstinU
I
NI
tnerruCtupnIV
NI
V=
CC
V,DNGro
CC
V6.3=5±
µA
I
NI
(
HOLD
)
tupnI
dloH
tnerruC
V
NI
V,V7.0=
CC
V3.2=54
V
NI
V,V7.1=
CC
V3.2=54-
V
NI
V,V8.0=
CC
V0.3=57
V
NI
V,V0.2=
CC
V0.3=57-
V
NI
0=otV,V6.3
CC
V6.3=005±
I
ZO
)stuptuOETATS-3(tnerruCtuptuOV
TUO
V=
CC
ro,DNGVCCV6.3=01±
I
CC
tnerruCylppuS
V
CC
=V6.3I,
TUO
0= µ ,A
V
NI
VroDNG=
CC
04
∆I
CC
tupnIreptnerruCylppuS
HGIHLTT@
V
CC
V0.3=ot6.3V
VtatupnIenO
CC
-V6.0
VtastupnIrehtO
CC
DNGro
057
C
I
stupnIlortnoC
V
NI
V=
CC
V,DNGro
CC
V3.3=
3
FpstupnIataD6
C
O
stuptuOV
O
V=
CC
V,DNGro
CC
V3.3=7
Page 5
PI74ALVCH16721
3.3V 20-Bit Flip-Flop with 3-State Outputs
5
PS8090C 02/07/00
sretemaraPnoitpircseDsnoitidnoC
)1(
V
CC
V2.0±V5.2=V
CC
V7.2=VCCV3.0±V3.3=
stinU
.niM
)2(
.xaM.niM
)2(
.xaM.niM
)2(
.xaM
f
KCOLC
ycneuqerFkcolC
C
L
Fp05=
R
L
005= Ω
005100510 051
zHM
f
XAM
ycneuqerFmumixaM051051051
t
HLP
t,
LHP
yaleDnoitagoporP
xQotKLC
0.1
6.5
0.1
1.5
0.1
3.4
sn
t
HZP
t,
LZP
emiTelbanEtuptuO
xQotEO
1.68.58.4
t
XHP
emiTelbasiDtuptuO
xQotEO
5.57.44.4
t
US
KLCerofeBataD ↑ 46.31.3
t
US
KLCerofeBNEKLC ↑ 4.31.37.2
t
H
KLCretfAataD ↑ 000
t
H
KLCretfANEKLC ↑ 000
t
W
htdiWesluP
)3(
WOLroHGIHKLC
3.33.33.3
∆ /t ∆v
)4(
LLAFroESIRnoitisnarTtupnI0010010 01V/sn
Switching Characteristics over Operating Range
(1)
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
Operating Characteristics, TA = 25ºC
retemaraPsnoitidnoCtseT
V
CC
V2.0±V5.2=VCCV3.0±V3.3=
stinU
.pyT
C
DP
noitapissiDrewoP
ecnaticapaC
delbanEstuptuO
C
L
zHM01=f,Fp05=
5595
Fp
delbasiDstuptuO6494
Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Recommended operating condition.
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