NTS0104 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 3 — 3 January 2012 15 of 25
NXP Semiconductors
NTS0104
Dual supply translating transceiver; open drain; auto direction sensing
14. Application information
14.1 Applications
Voltage level-translation applications. The NTS0104 can be used in point-to-point
applications to interface between devices or systems operating at different supply
voltages. The device is primarily targeted at I
2
C or 1-wire which use open-drain drivers, it
may also be used in applications where push-pull drivers are connected to the ports,
however the NTB0104 may be more suitable.
14.2 Architecture
The architecture of the NTS0104 is shown in Figure 11. The device does not require an
extra input signal to control the direction of data flow from A to B or B to A.
The NTS0104 is a "switch" type voltage translator, it employs two key circuits to enable
voltage translation:
1. A pass-gate transistor (N-channel) that ties the ports together.
2. An output edge-rate accelerator that detects and accelerates rising edges on the I/O
pins.
Fig 10. Typical operating circuit
001aan115
0.1 μF
0.1 μF 1 μF
V
CC(A)
V
CC(B)
1.8 V
SYSTEM
CONTROLLER
3.3 V
SYSTEM
GND
OE
A1
DATA
3.3 V1.8 V
B1
A2 B2
A3 B3
A4 B4
DATA
NTS0104
Fig 11. Architecture of NTS0104 I/O cell (one channel)
001aal965
V
CC(A)
V
CC(B)
AB
10 kΩ 10 kΩ
T1
T3
T2
ONE
SHOT
ONE
SHOT
GATE BIAS
