TI SN74ALVCH16271DGG

SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
D
D
D
D
D
D
DGG OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
EPIC  (Enhanced-Performance Implanted
CMOS) Submicron Process
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Latch-Up Performance Exceeds 250 mA Per
JESD 17
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
Package Options Include Plastic Shrink
Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages
OEA
LE1B
2B3
GND
2B2
2B1
VCC
A1
A2
A3
GND
A4
A5
A6
A7
A8
A9
GND
A10
A11
A12
VCC
1B1
1B2
GND
1B3
LE2B
SEL
description
This 12-bit to 24-bit bus exchanger is designed for
1.65-V to 3.6-V VCC operation.
The SN74ALVCH16271 is intended for
applications in which two separate data paths
must be multiplexed onto, or demultiplexed from,
a single data path. This device is particularly
suitable as an interface between conventional
DRAMs and high-speed microprocessors.
A data is stored in the internal A-to-B registers on
the low-to-high transition of the clock (CLK) input,
provided that the 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.
1
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
OEB
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
Transparent latches in the B-to-A path allow asynchronous operation to maximize memory access throughput.
These latches transfer data when the latch-enable (LE) inputs are low. The select (SEL) line selects 1B or 2B
data for the A outputs. Data flow is controlled by the active-low output enables (OEA, OEB).
To ensure the high-impedance state during power up or power down, the output enables 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.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN74ALVCH16271 is characterized for operation from –40°C to 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
Copyright  1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
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1
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
Function Tables
OUTPUT ENABLE
INPUTS
OUTPUTS
OEA
OEB
A
1B, 2B
H
H
Z
Z
H
L
Z
Active
L
H
Active
Z
L
L
Active
Active
A-TO-B STORAGE (OEB = L)
INPUTS
OUTPUTS
CLKENA1
CLKENA2
CLK
A
1B
2B
H
H
X
X
L
X
↑
L
1B0†
L
2B0†
X
L
X
↑
H
H
X
X
L
↑
L
X
L
X
L
↑
H
A0
H
B-TO-A STORAGE (OEA = L)
INPUTS
OUTPUT
A
LE
SEL
1B
2B
H
X
X
X
H
X
X
X
A0†
A0†
L
H
L
X
L
L
H
H
X
H
L
L
X
L
L
L
L
X
H
H
† Output level before the indicated steady-state
input conditions were established
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
logic diagram (positive logic)
CLK
29
2
LE1B
27
LE2B
CLKENA1
30
55
CLKENA2
56
OEB
28
SEL
LE
23
1
1B1
1D
OEA
G1
1
8
A1
LE
6
1
1D
2B1
CE
C1
1D
CE
C1
1D
1 of 12 Channels
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3
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V
Input voltage range, VI: Except I/O ports (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V
I/O ports (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Output voltage range, VO (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
Continuous output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous current through each VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mA
Package thermal impedance, θJA (see Note 3): DGG package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81°C/W
DL package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. This value is limited to 4.6 V maximum.
3. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions (see Note 4)
VCC
VIH
Supply voltage
VCC = 1.65 V to 1.95 V
VCC = 2.3 V to 2.7 V
High-level input voltage
VCC = 2.7 V to 3.6 V
VCC = 1.65 V to 1.95 V
VIL
VI
VO
IOH
Low-level input voltage
MIN
MAX
1.65
3.6
2
0.35 × VCC
0.7
0
0
IOL
Low level output current
Low-level
∆t/∆v
Input transition rise or fall rate
VCC = 1.65 V
VCC = 2.3 V
VCC = 2.7 V
VCC = 3 V
V
0.8
Output voltage
VCC = 2.7 V
VCC = 3 V
V
1.7
Input voltage
High level output current
High-level
V
0.65 × VCC
VCC = 2.3 V to 2.7 V
VCC = 2.7 V to 3.6 V
VCC = 1.65 V
VCC = 2.3 V
UNIT
VCC
VCC
V
V
–4
–12
–12
mA
–24
4
12
12
mA
24
10
ns/V
TA
Operating free-air temperature
–40
85
°C
NOTE 4: All unused control inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
1.65 V to 3.6 V
IOH = –100 µA
IOH = –4 mA
1.65 V
IOH = –6 mA
VOH
IOH = –12 mA
IOH = –24 mA
IOL = 100 µA
IOZ§
ICC
∆ICC
Ci
2
2.3 V
1.7
UNIT
2.7 V
2.2
3V
2.4
3V
2
V
0.2
2.3 V
0.4
2.3 V
0.7
2.7 V
0.4
3V
0.55
±5
3.6 V
VI = 0.58 V
VI = 1.07 V
1.65 V
25
1.65 V
–25
VI = 0.7 V
VI = 1.7 V
2.3 V
45
2.3 V
–45
VI = 0.8 V
VI = 2 V
3V
75
3V
–75
V
µA
µA
VI = 0 to 3.6 V‡
3.6 V
±500
VO = VCC or GND
VI = VCC or GND,
3.6 V
±10
µA
3.6 V
40
µA
750
µA
One input at VCC – 0.6 V,
Control inputs
2.3 V
0.45
IOL = 24 mA
VI = VCC or GND
II(hold)
(
)
MAX
VCC–0.2
1.2
1.65 V
IOL = 12 mA
II
TYP†
1.65 V to 3.6 V
IOL = 4 mA
IOL = 6 mA
VOL
MIN
IO = 0
Other inputs at VCC or GND
3 V to 3.6 V
VI = VCC or GND
VO = VCC or GND
3.3 V
3.5
pF
Cio
A or B ports
3.3 V
9
pF
† All typical values are at VCC = 3.3 V, TA = 25°C.
‡ This is the bus-hold maximum dynamic current. It is the minimum overdrive current required to switch the input from one state to another.
§ For I/O ports, the parameter IOZ includes the input leakage current.
timing requirements over recommended operating free-air temperature range (unless otherwise
noted) (see Figures 1 through 3)
VCC = 1.8 V
MIN
fclock
tw
tsu
th
Clock frequency
Hold time
MIN
MAX
VCC = 2.7 V
MIN
130
MAX
VCC = 3.3 V
± 0.3 V
MIN
130
3.3
3.3
3.3
A before CLK↑
¶
2.6
2.1
1.7
B before LE
¶
1.7
1.5
1.3
CLKEN before CLK↑
¶
1.6
1.3
1
A after CLK↑
¶
0.6
0.6
0.7
B after LE
¶
0.9
0.9
1.1
CLKEN after CLK↑
¶
1
0.9
0.9
UNIT
MAX
130
¶
Pulse duration, CLK high or low
Setup time
MAX
¶
VCC = 2.5 V
± 0.2 V
MHz
ns
ns
ns
¶ This information was not available at the time of publication.
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5
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figures 1 through 3)
FROM
(INPUT)
PARAMETER
TO
(OUTPUT)
fmax
CLK
VCC = 1.8 V
MIN
†
B
B
tpd
d
A
LE
SEL
ten
OEB or OEA
B or A
tdis
B or A
OEB or OEA
† This information was not available at the time of publication.
TYP
VCC = 2.5 V
± 0.2 V
MIN
MAX
130
VCC = 2.7 V
MIN
MAX
130
VCC = 3.3 V
± 0.3 V
MIN
UNIT
MAX
130
MHz
†
1
6.2
5
1
†
1
5.3
4.7
1.4
4
†
1
6
5.9
1.4
4.8
†
1.1
6.4
6.2
1.3
5.2
†
1
6
6.1
1
5.1
ns
†
1.4
5.4
4.6
1.7
4.2
ns
4.3
ns
operating characteristics, TA = 25°C
PARAMETER
A to B
Cpd
d
Power dissipation
capacitance
B to A
TEST CONDITIONS
Outputs enabled
VCC = 1.8 V
TYP
†
Outputs disabled
Outputs enabled
CL = 0
0,
f = 10 MHz
Outputs disabled
† This information was not available at the time of publication.
6
POST OFFICE BOX 655303
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VCC = 2.5 V
TYP
VCC = 3.3 V
TYP
92
105
†
61
76
†
39
43
†
11
13
UNIT
pF
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
PARAMETER MEASUREMENT INFORMATION
VCC = 1.8 V
2 × VCC
S1
1 kΩ
From Output
Under Test
Open
GND
CL = 30 pF
(see Note A)
1 kΩ
TEST
S1
tpd
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
GND
LOAD CIRCUIT
tw
VCC
Timing
Input
VCC/2
VCC/2
VCC/2
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VCC/2
VCC/2
0V
tPLH
Output
Control
(low-level
enabling)
tPLZ
VCC
VCC/2
VCC/2
VOL
Output
Waveform 2
S1 at GND
(see Note B)
VOL + 0.15 V
VOL
tPHZ
tPZH
VOH
VCC/2
0V
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
tPHL
VCC/2
VCC
VCC/2
tPZL
VCC
Input
VOLTAGE WAVEFORMS
PULSE DURATION
th
VCC
Data
Input
VCC/2
0V
0V
tsu
Output
VCC
VCC/2
Input
VCC/2
VOH
VOH – 0.15 V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
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7
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
PARAMETER MEASUREMENT INFORMATION
VCC = 2.5 V ± 0.2 V
2 × VCC
S1
500 Ω
From Output
Under Test
Open
GND
CL = 30 pF
(see Note A)
500 Ω
TEST
S1
tpd
tPLZ/tPZL
tPHZ/tPZH
Open
2 × VCC
GND
LOAD CIRCUIT
tw
VCC
Timing
Input
VCC/2
VCC/2
VCC/2
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VCC/2
VCC/2
0V
tPLH
Output
Control
(low-level
enabling)
tPLZ
VCC
VCC/2
VCC/2
VOL
Output
Waveform 2
S1 at GND
(see Note B)
VOL + 0.15 V
VOL
tPHZ
tPZH
VOH
VCC/2
0V
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
tPHL
VCC/2
VCC
VCC/2
tPZL
VCC
Input
VOLTAGE WAVEFORMS
PULSE DURATION
th
VCC
Data
Input
VCC/2
0V
0V
tsu
Output
VCC
VCC/2
Input
VCC/2
VOH
VOH – 0.15 V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 2. Load Circuit and Voltage Waveforms
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74ALVCH16271
12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
WITH 3-STATE OUTPUTS
SCES017E – JULY 1995 – REVISED FEBRUARY 1999
PARAMETER MEASUREMENT INFORMATION
VCC = 2.7 V AND 3.3 V ± 0.3 V
6V
S1
500 Ω
From Output
Under Test
GND
CL = 50 pF
(see Note A)
TEST
S1
tpd
tPLZ/tPZL
tPHZ/tPZH
Open
6V
GND
Open
500 Ω
tw
LOAD CIRCUIT
2.7 V
2.7 V
Timing
Input
1.5 V
Input
1.5 V
0V
1.5 V
0V
tsu
VOLTAGE WAVEFORMS
PULSE DURATION
th
2.7 V
Data
Input
1.5 V
1.5 V
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
2.7 V
Output
Control
(low-level
enabling)
1.5 V
0V
tPZL
2.7 V
Input
1.5 V
1.5 V
0V
tPLH
VOH
Output
1.5 V
Output
Waveform 1
S1 at 6 V
(see Note B)
tPLZ
3V
1.5 V
tPZH
tPHL
1.5 V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.5 V
Output
Waveform 2
S1 at GND
(see Note B)
VOL + 0.3 V
VOL
tPHZ
1.5 V
VOH
VOH – 0.3 V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 3. Load Circuit and Voltage Waveforms
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9
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright  1999, Texas Instruments Incorporated