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參數(shù)資料
| 型號： | NCN4557MTR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD/SIM DUAL 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | * |
| 應(yīng)用： | * |
| 接口： | * |
| 電源電壓： | * |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN（3x3） |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
NCN4557
http://onsemi.com
11
this state or 8
ms after the ENABLE pin is set LOW in
the other cases.
CRD_I/O is forced to LOW about 8 ms after the
ENABLE pin is set LOW.
Then CRD_VCC Supply Shuts Off
Figure 13. NCN4557 Power Down Sequence
CRD_VCCA/B
CRD_IOA/B
CRD_CLKA/B
CRD_RSTA/B
ENABLE
TOFF ~ 8.0 ms
Input Schmitt Triggers
All the logic input pins (excepted I/O and CRD_I/O,
Figure 3) have builtin Schmitt trigger circuits to prevent
the NCN4557 against uncontrolled operation. The typical
dynamic characteristics of the related pins are depicted in
Figure 14.
OUTPUT
VDD
ON
OFF
0.2 x VDD
or
0.4 V
0.7 x VDD
INPUT
Figure 14. Typical Schmitt Trigger Characteristics
Shutdown Operating
In order to save power or for other purpose required by
the application it is possible to put the NCN4557 in a
shutdown mode by setting LOW the pin ENABLE. On the
other hand the device enters automatically in a shutdown
mode when VDD becomes lower than 1.0 V typically.
ESD Protection
The NCN4557 CRD interface features an Human Body
Model ESD voltage protection in excess of 8 kV for all the
CRD
pins
(CRD_IOA
&
B,
CRD_CLKA
&
B,
CRD_RSTA & B, CRD_VCCA & B and GND). All the
other pins (microcontroller side) sustain at least 2 kV.
These values are guaranteed for the device in its full
integrity without considering the external capacitors added
to the circuit for a proper operating. Consequently in the
operating conditions it is able to sustain much more than
8 kV on its CRD pins making it perfectly protected against
electrostatic discharge well over the Human Body Model
ESD voltages required by the ISO7816 standard (4 kV).
Printed Circuit Board Layout
Careful layout routing will be applied to achieve a good
and efficient operating of the device in its mobile or
portable environment and fully exploit its performance.
The bypass capacitors have to be connected as close as
possible to the device pins (CRD_VCCA and B, VDD or
VBAT) in order to reduce as much as possible parasitic
behaviors (ripple and noise). It is recommended to use
ceramic capacitors.
The exposed pad of the QFN16 package will be
connected to the ground. A relatively large ground plane is
recommended.
ORDERING INFORMATION
Device
Package
Shipping
NCN4557MTG
QFN16
(PbFree)
123 Units / Rail
NCN4557MTR2G
QFN16
(PbFree)
3000 / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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