1PS8372 12/17/99
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PI74ALVCHR16269
12-Bit to 24-Bit Registered Bus Exchanger
with 3-State Outputs
Logic Block Diagram
Product Description
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced using the Companys advanced 0.5 micron CMOS
technology, achieving industry leading speed.
The PI7ALVCHR16269 is used in applications in which two separate
ports must be multiplexed onto, or demultiplexed from, a single port. It
is particularly suitable as an interface between synchronous DRAMs
and high-speed microprocessors.
Data is stored on the internal B-port registers on the low-to-high
transition of the clock (CLK) input when the appropriate clock-enable
(CLKENA) inputs are low. Proper control of these inputs allows two
sequential 12-bit words to be presented as a 24-bit word on the B-port.
For data transfer in the B-to-A direction, a single storage register is
provided. The select (SEL) line selects 1B or 2B data for the A outputs.
The register on the A output permits the fastest possible data transfer,
thus extending the period during which the data is valid on the bus. The
control terminals are registered so that all transactions are synchronous
with CLK. Data flow is controlled by the active-low output enables
(OEA, OEB1, and OEB2).
To ensure the high-impedance state during power up or power down,
a clock pulse should be applied as soon as possible and 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.
Due to OE being routed through a register, the active state of the
outputs cannot be determined prior to the arrival of the first clock
pulse.
Active bus-hold circuitry is provided to hold unused or floating data
inputs at a valid logic level.
All outputs are designed to sink up to 12mA and include 26-ohm
resistors to reduce overshoot and undershoot.
Product Features
· PI74ALVCHR16269 is designed for low voltage operation
·V
CC = 2.3V to 3.6V
· Hysteresis on all inputs
· Typical VOLP (Output Ground Bounce)
< 0.8V at VCC = 3.3V, TA = 25°C
· Typical VOHV (Output VOH Undershoot)
< 2.0V at VCC = 3.3V, TA = 25°C
· All output ports have equivalent 26W series resistors,
no external resistors are required
· 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)
2PS8372 12/17/99
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PI74ALVCHR16269
12-Bit to 24-Bit Registered Bus Exchanger
with 3-State Outputs
stupnIstuptuO
KLCAEOBEOA B2,B1
↑HHZ Z
↑HLZ evitcA
↑LH evitcAZ
↑LL evitcAevitcA
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Irrelevant
Z = High Impedance
↑ = Transition, Low to High
2. Output level before indicated steady state input conditions established
stupnI stuptuO
A
KLCLESB1B2
XHXX0A
)2(
XLXX0A
)2(
↑HLXL
↑HΗXH
↑LXLL
↑LXHH
STUPNISTUPTUO
1ANEKLC2ANEKLCKLCAB1B2
LH↑LLB2
0)2(
LH↑HHB2
0)2(
LL↑LL L
LL↑HH H
HL↑LB1
0)2(
L
HL↑HB1
0)2(
H
HHXXB1
0)2(
B2
0)2(
Pin Name Description
OE Output Enable Input (Active LOW)
CLK Clock
SEL Select (Active Low)
CLKEN Clock Enable (Active Low)
A,1B,2B 3-State Outputs
GND Ground
VCC Power
1
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
Product Pin Description
Product Pin Configuration
56-Pin
A, V
OEA
OEB1
2B3
GND
2B2
2B1
VCC
A1
A2
A3
GND
A4
A5
A6
A7
A8
A9
GND
A10
A11
A12
VCC
1B1
1B2
GND
1B3
NC
SEL
OEB2
CLKENA2
2B4
GND
2B5
2B6
VCC
2B7
2B8
2B9
GND
2B10
2B11
2B12
1B12
1B11
1B10
GND
1B9
1B8
1B7
VCC
1B6
1B5
GND
1B4
CLKENA1
CLK
Truth Tables(1)
A to B STORAGE (OEB = L)
B to A STORAGE (OEA = L)
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PI74ALVCHR16269
12-Bit to 24-Bit Registered Bus Exchanger
with 3-State Outputs
Note:
1. Unused control inputs must be held HIGH or LOW to prevent them from floating.
DC Electrical Characteristics (Over the Operating Range, TA = 40°C to +85°C, VCC = 3.3V ± 10%)
sretemaraPnoitpircseDsnoitidnoCtseT.niM.pyT.xaMstinU
V
CC
egatloVylppuS3.26.3
V
V
HI )1(
egatloVHGIHtupnI V
CC
V7.2otV3.2=7.1
V
CC
V6.3otV7.2=0.2
V
LI )1(
egatloVWOLtupnI V
CC
V7.2otV3.2=7.0
V
CC
V6.3otV7.2=8.0
V
NI )1(
egatloVtupnI0V
CC
V
TUO )1(
egatloVtuptuO0V
CC
I
HO )1(
level-HGIH
tnerruCtuptuO
6
Am
8
V
CC
V0.3=21
I
LO )1(
level-WOL
tnerruCtuptuO
V
CC
V3.2=6
V
CC
V7.2=8
V
CC
V0.3=21
T
A
erutarepmeTriA-eerFgnitarepO04-58Cº
D/tA
V
etaRllaFroesiRnoitisnarTtupnI01V/sn
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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ................................................ 65°C to +150°C
Supply Voltage Range, VCC ................................................. 0.5V to 4.6V
Input Voltage Range,VI: Except
I/O ports(1) ................................................................................ 0.5V to 4.6V
I/O ports(1,2) ............................................................... 0.5V to VCC + 0.5V
Output Voltage Range, VO(1,2) .............................. 0.5V to VCC + 0.5V
Input Clamp current, IIK (VI < 0) ............................................ 50mA
Output Clamp current, IOK (VO < 0) ....................................... 50mA
Continous Output Current, IO.................................................. ±50mA
Continous Current through each VCC or GND ...................... ±100mA
Maximum Power Dissipation:
A package ........................................................................................1W
V package .....................................................................................1.4W
Notes:
1. The input and output negative-voltage ratings maybe exceeded if the input and
outputclamp-current ratings are observed.
2. This value is limited to 4.6V maximum.
4PS8372 12/17/99
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PI74ALVCHR16269
12-Bit to 24-Bit Registered Bus Exchanger
with 3-State Outputs
sretemaraPsnoitidnoCtseTV
CC )1(
.niM.pyT
)2(
.xaMstinU
V
HO
I
HO
=01- 0Αµ.xaMot.niMV
CC
2.0-
V
I
HO
=4-mΑV
HI
=V7.1V3.29.1
V
HI
=V0.2V7.22.2
I
HO
=6-mΑV
HI
=V7.1V3.27.1
V
HI
=V0.2V0.34.2
I
HO
=8-mΑV
HI
=V0.2V7.20.2
I
HO
=21-mΑV
HI
=V0.2V0.30.2
V
LO
I
LO
=010Αµ.xaMot.niM2.0
I
LO
=4mΑV
LI
=V7.0V3.24.0
V
LI
=V8.0V7.24.0
I
LO
=6mΑV
LI
=V7.0V3.255.0
V
LI
=V8.0V0.355.0
I
LO
=8mΑV
LI
=V8.0V7.26.0
I
LO
=21mΑV
LI
=V8.0V0.38.0
I
I
V
I
=V
CC
roDNGV6.35±
Αµ
I
I
)dloH(
)3(
V
I
=V7.0 V3.2 54
V
I
=V7.154-
V
I
=V8.0 V0.3 57
V
I
=V0.257-
V
I
=0 V6.3otV6.3005±
I
ZO )4(
V
O
=V
CC
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I
CC
V
I
=V
CC
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O
0=V6.304
Ι∆
CC
VtatupnienO
CC
rehtO,V6.0-
Vtastupni
CC
DNGro V6.3otV3057
C
I
ClortnoIstupnV
I
=V
CC
DNGroV3.35.3 Fp
C
OI
AroBP stroV
O
=V
CC
DNGroV3.35.8
DC Electrical Characteristics-Continued (Over the Operating Range, TA = -40ºC to +85ºC, VCC = 3.3V ± 10%
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 3.3V, +25ºC ambient and maximum loading.
3. Bus hold maximum dynamic current required to switch the input from one state to another
4. For I/O ports, the IOZ includes the input leakage current.
5PS8372 12/17/99
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PI74ALVCHR16269
12-Bit to 24-Bit Registered Bus Exchanger
with 3-State Outputs
sretemaraPnoitpircseD
V
CC
±V5.2=
V2.0V
CC
V7.2=
V
CC
±V3.3=
V3.0
stinU.niM.xaM.niM.xaM.niM.xaM
f
KCOLC
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t
W
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sn
t
US
emitputeS
KLCerofebatadA ↑4.14.11
KLCerofebatadB ↑6.15.11.1
KLCerofebLES ↑8.01.13.1
ANEKLCro1ANEKLC 2
KLCerofeb ↑8.018.0
KLCerofebatadEO ↑7.16.12.1
t
H
emitdloH
KLCretfaatadA ↑9.09.02.1
KLCretfaatadB ↑8.06.01
KLCretfaLES ↑1.18.07.1
ANEKLCro1ANEKLC 2
KLCretfa ↑4.116.1
KLCretfaEO ↑9.08.02.1
Timing Requirements over Operating Range
Notes:
1. Unused control inputs must be held HIGH or LOW to prevent them from floating.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
Switching Characteristics over Operating Range(1)
sretemaraP morF
)tupnI(
oT
)tuptuO(
V
CC
V2.0±V5.2=V
CC
V7.2=V
CC
V3.0±V3.3= stinU
.niM
)2(
.xaM.niM
)2(
.xaMniM .
)2(
.xaM
f
XAM
59511531
sn
t
DP
KLC
B3.27.79.62.28.5
A9.14.68.522.5
t
NE
B5.27.79.63.28.5
A2.27.661.23.5
t
SID
B3.31.87.64.26
A7.28 2.61.26
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 = 25°C
retemaraP
tseT
snoitidnoC
V
CC
V2.0±V5.2=V
CC
V3.0±V3.3=
stinUlacipyT
C
DP
ecnaticapaCnoitapissiDrewoP
regnahcxErep
delbanEstuptuO C
L
,Fp0=
zHM01=F
241271 Fp
delbasiDstuptuO511921
