Low voltage CMOS 16-bit bus transceiver (3-state)
Features
■ 5V tolerant inputs and outputs
■ High speed:
–t
= 4.5ns (Max) at V
PD
■ Power down protection on inputs and outputs
■ Symmetrical output impedance:
–|I
■ PCI bus levels guaranteed at 24mA
■ Balanced propagation delays:
–t
■
Operating voltage range:
–V
■ Pin and function compatible with
| = IOL = 24mA (Min) at VCC = 3V
OH
≅ t
PLH
PHL
(Opr) = 2.0V to 3.6V
CC
74 series 16245
■ Latch-up performance exceeds
500mA (JESD 17)
■ ESD performance:
– HBM > 2000V
(MIL STD 883 method 3015); MM > 200V
CC
= 3V
74LCX16245
with 5V tolerant inputs and outputs
TSSOP48
Description
The 74LCX16245 is a low voltage CMOS 16 bit
bus transceiver (3-state) fabricated with submicron silicon gate and double-layer metal wiring
2
C
MOS technology. It is ideal for low power and
high speed 3.3V applications; it can be interfaced
to 5V signal environment for both inputs and
outputs.
This IC is intended for two-way asynchronous
communication between data buses; the direction
of data transmission is determined by DIR input.
The two enable inputs nG
the device so that the buses are effectively
isolated.
can be used to disable
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
All floating bus terminals during High Z State must
be held HIGH or LOW.
Order codes
Part number Package Packaging
74LCX16245TTR TSSOP48 Tape and reel
February 2007 Rev 7 1/15
www.st.com
15
Contents 74LCX16245
Contents
1 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
74LCX16245 Logic symbols and I/O equivalent circuit
1 Logic symbols and I/O equivalent circuit
Figure 1. IEC logic symbols
Figure 2. Input and output equivalent circuit
3/15
Pin settings 74LCX16245
2 Pin settings
2.1 Pin connection
Figure 3. Pin connection (top through view)
4/15
74LCX16245 Logic states
2.2 Pin description
Table 1. Pin description
Pin N° Symbol Name and function
1 1DIR Directional control
2, 3, 5, 6,
8, 9, 11, 12
13, 14, 16, 17,
19, 20, 22, 23
24 2DIR Directional control
25 2G
36, 35, 33, 32,
30, 29, 27, 26
47, 46, 44, 43,
41, 40, 38, 38
48 1G
4, 10, 15, 21,
28, 34, 39, 45
7, 18, 31, 42
3 Logic states
3.1 Truth table
1B1 to 1B8 Data inputs/outputs
2B1 to 2B8 Data inputs/outputs
Output enable input
2A1 to 2A8 Data inputs/outputs
1A1 to 1A8 Data inputs/outputs
Output enable input
GND Ground (0V)
V
CC
Positive supply voltage
Table 2. Truth table
G
L L Output Input A = B
L H Input Output B = A
HXZ ZZ
Note: X : Do not care
Z : High impedance
Inputs Function Output
DIR A BUS B BUS Yn
5/15
Maximum rating 74LCX16245
4 Maximum rating
Stressing the device above the rating listed in the “absolute maximum ratings” table may
cause permanent damage to the device. these are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. exposure to absolute maximum rating conditions for
extended periods may affect device reliability. refer also to the STMicroelectronics sure
program and other relevant quality documents.
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
V
I
I
I
GND
T
T
1. IO absolute maximum rating must be observed
2. VO < GND
Supply voltage -0.5 to +7.0 V
CC
V
DC input voltage -0.5 to +7.0 V
I
DC output voltage (OFF state) -0.5 to +7.0 V
O
DC output voltage (high or low state)
O
I
DC input diode current -50 mA
IK
DC output diode current
OK
I
DC output current ±50 mA
O
DC supply current per supply pin ± 100 mA
CC
(2)
(1)
-0.5 to VCC + 0.5
-50 mA
DC ground current per supply pin ± 100 mA
Storage temperature -65 to +150 °C
stg
Lead temperature (10 sec) 300 °C
L
V
4.1 Recommended operating conditions
Table 4. Recommended operating conditions
Symsbol Parameter Value Unit
V
V
V
V
Supply voltage
CC
Input voltage 0 to 5.5 V
I
Output voltage (OFF state) 0 to 5.5 V
O
Output voltage (high or low state)
O
IOH, IOLHigh or low level output current (VCC = 3.0 to 3.6V)
I
, IOLHigh or low level output current (VCC = 2.7V)
OH
T
dt/dv
1. Truth table guaranteed: 1.5V to 3.6V
2. VIN from 0.8V to 2V at VCC = 3.0V
Operating temperature -40 to 85 °C
op
Input rise and fall time
6/15
(1)
(2)
2.0 to 3.6 V
0 to V
CC
± 24 mA
± 12 mA
0 to 10 ns/V
V
74LCX16245 Electrical characteristics
5 Electrical characteristics
Table 5. DC specifications
Test condition Value
Symbol Parameter
V
CC
(V)
V
V
High level input voltage
IH
Low level input voltage 0.8 V
IL
2.7 to 3.6
2.7 to 3.6
2.7
V
High level output voltage
OH
3.0
2.7 to 3.6
2.7
V
Low level output voltage
OL
3.0
I
Input leakage current 2.7 to 3.6
I
I
I
I
∆I
Table 6. Dynamic switching characteristics
Power OFF leakage
off
current
High impedance output
OZ
leakage current
Quiescent supply current 2.7 to 3.6
CC
I incr. per Input 2.7 to 3.6
CC
0
2.7 to 3.6
IO = -100µAVCC-0.2
= -12mA
I
O
I
= -18mA
O
I
= -24mA
O
IO = 100µA
= 12mA
I
O
I
= 16mA
O
I
= 24mA
O
= 0 to 5.5V
V
I
VI or VO = 5.5V
V
= VIH or V
I
VO = 0 to V
V
= VCC or GND
I
V
or VO = 3.6 to 5.5V
I
= VCC - 0.6V
V
IH
IL
CC
-40 to 85°C
Min Max
2.0 V
2.2
2.4
2.2
0.2
0.4
0.4
0.55
± 5 µA
10 µA
± 5 µA
20
± 20
500 µA
Test condition Value
= 25 °C
Symbol Parameter
V
CC
(V)
V
OLP
V
OLV
1. Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to
HIGH. The remaining output is measured in the LOW state.
Dynamic low level quiet
(1)
output
3.3
C
= 50pF
L
= 0V, VIH = 3.3V
V
IL
T
A
Min Typ Max
0.8
-0.8
Unit
V
V
µA
Unit
V
7/15
Electrical characteristics 74LCX16245
Table 7. AC electrical characteristics
Test condition Value
Symbol Parameter
V
CC
(V)
C
(pF)
L
R
L
(Ω)
t
s
(ns)
= t
r
-40 to 85 °C
Min Max
Unit
t
PLH tPHL
t
PZL tPZH
t
PLZ tPHZ
t
OSLH
t
OSHL
1. Skew is defined as the absolute value of the difference between the actual propagation delay for any two
outputs of the same device switching in the same direction, either HIGH or LOW
(t
OSLH
2. Parameter guaranteed by design
Table 8. Capacitive characteristics
Propagation delay
time
Output enable
time
Output disable
time
Output to output
skew time
= | t
PLHm
- t
PLHn
(1) (2)
|, t
OSHL
2.7
50 500 2.5
3.0 to 3.6 1.5 4.5
2.7
50 500 2.5
3.0 to 3.6 1.5 6.5
2.7
50 500 2.5
3.0 to 3.6 1.5 6.4
3.0 to 3.6 50 500 2.5 1.0 ns
= | t
PHLm
- t
PHLn
|)
1.5 5.2
1.5 7.2
1.5 6.9
Test condition Value
T
Symbol Parameter
V
CC
(V)
= 0 to V
C
C
C
1. CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the
operating current consumption without load. (Refer to Test Circuit). Average operating current can be
obtained by the following equation. I
Input capacitance 3.3
IN
Output capacitance 3.3
OUT
Power dissipation
PD
capacitance
(1)
3.3
= CPD x VCC x fIN + ICC/16 (per circuit)
CC(opr)
V
IN
V
= 0 to V
IN
= 10MHz
f
IN
= 0 or V
V
IN
CC
CC
CC
= 25 °C
A
Min Typ Max
7pF
8pF
20 pF
ns
ns
ns
Unit
8/15
74LCX16245 Test circuit
6 Test circuit
Figure 4. Test circuit
Figure 5. Test circuit
Test Switch
t
t
t
PLH
PZL
PZH
, t
PHL
, t
PLZ
, t
PHZ
Open
6V
GND
CL = 50pF or equivalent (includes jig and probe capacitance)
R
= R1 = 500Ω or equivalent
L
R
= Z
T
of pulse generator (typically 50Ω)
OUT
9/15
Waveforms 74LCX16245
7 Waveforms
Figure 6. Propagation delays (f = 1MHz; 50% duty cycle)
Figure 7. Output enable and disable time (f = 1MHz; 50% duty cycle)
10/15
74LCX16245 Package mechanical data
8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect . The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
11/15
Package mechanical data 74LCX16245
TSSOP48 MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 1.2 0.047
A1 0.05 0.15 0.002 0.006
A2 0.9 0.035
b 0.17 0.27 0.0067 0.011
c 0.09 0.20 0.0035 0.0079
D 12.4 12.6 0.488 0.496
E 8.1 BSC 0.318 BSC
E1 6.0 6.2 0.236 0.244
e 0.5 BSC 0.0197 BSC
K0° 8°0° 8°
L 0.45 0.75 0.018 0.030
mm. inch
A2
A
A1
PIN 1 IDENTIFICATION
b
1
e
D
K
c
E1
L
E
7065588D
12/15
74LCX16245 Package mechanical data
Tape & Reel TSSOP48 MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 30.4 1.197
Ao 8.7 8.9 0.343 0.350
Bo 13.1 13.3 0.516 0.524
Ko 1.5 1.7 0.059 0.067
Po 3.9 4.1 0.153 0.161
P 11.9 12.1 0.468 0.476
mm. inch
13/15
Revision history 74LCX16245
9 Revision history
Table 9. Revision history
Date Revision Changes
15-Sep-2004 6 Ordering Codes Revision - pag. 1.
06-Feb-2007 7 Document reformatted, temperature ranges updated
14/15
74LCX16245
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2007 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
15/15
Loading...