參數(shù)資料
型號： MAX3454EEUD+T
廠商： Maxim Integrated Products
文件頁數(shù)： 2/19頁
文件大?。?/td> 0K
描述： IC TXRX USB ESD-PROT 14TSSOP
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 2,500
類型： 收發(fā)器
規(guī)程： USB 2.0
電源電壓： 1.65 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 14-TSSOP
包裝： 帶卷 (TR)
MAX3453E–MAX3456E
±15kV ESD-Protected USB Transceivers
10
______________________________________________________________________________________
Detailed Description
The MAX3453E–MAX3456E USB-compliant transceivers
convert single-ended or differential logic-level signals to
USB signals, and USB signals to single-ended or differ-
ential logic-level signals. The MAX3453E fully complies
with full-speed (12Mbps) operation under USB specifica-
tion 2.0. The MAX3454E–MAX3456E fully comply with
USB specification 1.1, and full-speed (12Mbps) and low-
speed (1.5Mbps) operation under USB specification 2.0.
The MAX3453E–MAX3456E operate with VL as low as
+1.65V, ensuring compatibility with low-voltage ASICs.
The MAX3453E–MAX3456E derive power from the USB
host (VBUS) or from a single-cell Li+ battery
(MAX3454E/MAX3456E) connected to VBUS or from a
+3.3V regulated supply connected to VBUS and VTRM.
The MAX3453E–MAX3456E meet the physical layer
specifications for logic-level supply voltages (VL) from
+1.65V to +3.6V. Integrated ±15kV ESD protection safe-
guards the D+ and D- USB I/O ports.
The MAX3453E/MAX3454E feature an enumerate func-
tion providing an internal 1.5k
pullup resistor from D+
(MAX3453E/MAX3454E) or D- (MAX3454E only) to
VTRM. The enumerate function disconnects the 1.5k
pullup resistor, allowing the MAX3453E/MAX3454E to
simulate a bus disconnect while powered and connect-
ed to the USB cable. The MAX3453E/MAX3455E fea-
ture a bus-detect output (BD) that asserts high if VBUS
> +4V. BD asserts low if VBUS < +3.6V. The
MAX3455E/MAX3456E require external pullup resistors
from either D+ or D- to VTRM to utilize the appropriate
bus speed. The MAX3456E is pin-for-pin compatible
with the Micrel MIC2550A.
Applications Information
Power-Supply Configurations
Normal Operating Mode
Connect VL and VBUS to system power supplies (Table 1).
Connect VL to a +1.65V to +3.6V supply. Connect VBUS
to a +4.0V to +5.5V supply. Alternatively, the MAX3454E/
MAX3456E can derive power from a single Li+ battery.
Connect the battery to VBUS.
Additionally, the MAX3454E/MAX3456E can derive
power from a +3.3V ±10% voltage regulator. Connect
VBUS and VTRM to an external +3.3V voltage regulator.
VBUS no longer consumes current to power the internal
linear regulator in this configuration.
Table 1. Power-Supply Configurations
VBUS (V)
VTRM (V)
VL (V)
CONFIGURATION
NOTES
4.0 to 5.5
3.0 to 3.6 output
1.65 to 3.6
Normal mode
—
3.1 to 4.5
3.0 to 3.6 output
1.65 to 3.6
Battery supply
MAX3454E/MAX3456E
3.0 to 3.6
3.0 to 3.6 input
1.65 to 3.6
Voltage regulator supply
MAX3454E/MAX3456E
GND or floating
High-Z
1.65 to 3.6
Sharing mode
Table 2
3.0 to 5.5
High-Z
GND or floating
Disable mode
Table 2
*High impedance or low.
**High or low.
INPUTS/OUTPUTS
DISABLE MODE
SHARING MODE
VBUS/VTRM
+3.0V to +5.5V / High Impedance
Floating or connected to GND
(MAX3453E/MAX3454E/MAX3456E) / High Impedance
< 3.6V (MAX3453E/MAX3455E) / High Impedance
VL
Floating or connected to GND
1.65V to 3.6V input
D+ and D-
High impedance
High impedance for OE = low
VP and VM
Invalid*
High for OE = high
RCV
Invalid*
Undefined**
SPD (MAX3454E–MAX3456E),
SUS, OE, ENUM
(MAX3453E/MAX3454E)
High impedance
BD (MAX3453E/MAX3455E)
Invalid*
Low
Table 2. Disable-Mode and Sharing-Mode Connections
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