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PDF PCA9521 Data sheet ( Hoja de datos )

Número de pieza PCA9521
Descripción Fast dual bidirectional bus buffer
Fabricantes NXP Semiconductors 
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PCA9521
Fast dual bidirectional bus buffer
Rev. 2 — 19 March 2013
Product data sheet
1. General description
The PCA9521 is a monolithic bipolar integrated circuit for bus buffering in applications
including I2C-bus, SMBus, PMBus, and other systems based on similar principles.
The buffer extends the bus load limit by buffering both the SCL and SDA lines. It supports
up to 400 pF loads on each side of the buffer at 400 kHz. Higher capacitance is supported
at lower speeds, and lower capacitance at higher speeds up to 1 MHz.
The enable function allows sections of the bus to be isolated. Individual parts of the
system can be brought on-line successively. This means a controlled start-up using a
diverse range of components, operating speeds and loads is easily achieved. Systems
employing removable components on a back-plane (for example, telecommunications
racks) can use the enable pin and the high-impedance ports on power-down to safely
install and remove components in active systems.
Bus level translation between a very wide range of bus voltages, from 1.8 V to 10 V, is
supported. This feature provides enormous flexibility in interfacing systems of different
technologies.
The unique operation of the PCA9521 provides one of the fastest response times of such
bidirectional buffers, ensuring any glitches (common to other buffers) are kept well within
the 50 ns I2C-bus specification. Additionally, it does this without the need for ‘rise-time
accelerators’ which, combined with low noise margins, may cause glitches outside of the
I2C-bus specification.
2. Features and benefits
Dual, bidirectional unity gain buffer
Fast switching times allow operation in excess of 1 MHz
Supports I2C-bus (Standard-mode and Fast-mode), SMBus (standard and high power
mode), PMBus and IPMB
Enable allows bus segments to be disconnected
Low standby current when not enabled
Application/removal of power to IC will not interfere with other bus activity
6 mA (static) pull-down capability supports a wide range of bus standards
Low noise susceptibility
Low input-output offset voltage
Threshold and offset parameters allow the connection of several devices in series
Bus levels independent of supply voltage
Operating voltages from 2.7 V to 5.5 V
Wide range of bus voltages from 1.8 V to 10 V

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PCA9521 pdf
NXP Semiconductors
PCA9521
Fast dual bidirectional bus buffer
8. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min
VCC
Vn
VI(EN)
supply voltage
voltage on any other pin
input voltage on pin EN
SA1, SA2, SB1, SB2
[1] 0.3
[1] 0.3
[1] 0.3
IIO
input/output current
any pin
-
Ptot
Tstg
Tamb
total power dissipation
storage temperature
ambient temperature
operating
-
55
40
[1] Voltages are specified with respect to pin 4 (GND).
9. Characteristics
Max
+7
+12
+12
20
300
+125
+85
Unit
V
V
V
mA
mW
C
C
Table 5. Characteristics
Tamb = 40 C to +85 C; voltages are specified with respect to ground (GND).
Symbol Parameter
Conditions
Power supply
VCC supply voltage
ICC supply current
Buffer ports (SA1, SA2, SB1, SB2)
operating
operating; VCC = VI(EN) = 5.5 V
standby; VCC = 5.5 V; VI(EN) = 0 V
Vbus
Vth(IL)
bus voltage
LOW-level input threshold
voltage
Vth(IH)
HIGH-level input threshold
voltage
IIL
IO(sink)
Voffset
LOW-level input current
output sink current
offset voltage
IL leakage current
Cio input/output capacitance
Enable (EN)
drive current; Vbus < VCC
LOW-level; Vbus(out) = 0.4 V
input/output; VCC = 5 V
IOL = 5 mA; Vbus(in) = 50 mV
IOL = 500 A; Vbus(in) = 50 mV
IOL = 1.2 mA; Vbus(in) = 200 mV
Vbus VCC
Ven enable voltage
Vdis disable voltage
II input current
active
standby
Ven > 1.2 V
Min Typ Max Unit
2.7 -
5.5 V
-
6-
mA
- 670 900 A
1.8 -
--
0.41VCC -
- 6
6-
10 V
0.3VCC V
-V
20 A
- mA
- 230 300 mV
- 90 125 mV
- 90 125 mV
- - 5 A
[1] -
- 10 pF
1.3 -
--
0.7 -
-V
0.7 V
5 A
PCA9521
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 March 2013
© NXP B.V. 2013. All rights reserved.
5 of 23

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PCA9521 arduino
NXP Semiconductors
PCA9521
Fast dual bidirectional bus buffer
5 V 3.3 V
R1
1.5 kΩ
VCC
SCL
SDA
BUS MASTER
U1
R2
1.5 kΩ
R3
1.1 kΩ
VCC
SA1 SA2
SB1 SB2
PCA9521
EN
U2
R4
1.1 kΩ
VDD
SCL SC0
SDA
SD0
INT[3:0]
A0
A1
SC1
SD1
SC2
SD2
SC3
Using the PCA9521,
up to 400 pF may be
connected to each
and every bus 0
through bus 3.
A2 SD3
PCA9544A
U3
002aaf291
Alternately, using the PCA9546A (which allows multiple outputs to be selected) you would simply
place a PCA9521 on each output on the right-hand side, rather than a single PCA9521 on the
left-hand side
Fig 14. PCA9521 multiplexer isolation application
5V
R1
1.5 kΩ
SCL
SDA
VCC
A
B
C
3-to-8
demultiplexer
74LS137
U1
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
R2
1.5 kΩ
VCC
SA1 SA2
SB1 SB2
PCA9521
EN
U2
5V
multiple isolated buses with
400 pF load capacitance each
VCC
SA1 SA2
SB1 SB2
PCA9521
EN
U3
002aaf292
Fig 15. PCA9521 bus multiplexer application driven from a simple logic device
PCA9521
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 March 2013
© NXP B.V. 2013. All rights reserved.
11 of 23

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