MAX3344E Datasheet, PDF (6/15 Pages) Maxim Integrated Products – +-5kV ESD-Protected USB Transceivers in UCSP with USB Detect

±15kV ESD-Protected USB Transceivers
in UCSP with USB Detect
Pin Description
PIN
TSSOP UCSP
NAME
INPUT/
O U T PU T
FUNCTION
1
D2
RCV
Output
Receiver Output. Single-ended CMOS output. RCV responds to the differential input
on D+ and D-.
2
D1
VPO
Input Logic-Level Data Input. VPO is level translated to D+.
Mode-Control Input. Selects differential (mode 1) or single-ended (mode 0) input for
3
C2
MODE
Input the system side when converting logic-level signals to USB level signals. Force
MODE high to select mode 1. Force MODE low to select mode 0.
4
C1
VMO
Input Logic-Level Data Input. VMO is level translated to D-.
5
B1
OE
Input
Output Enable. Drive OE low to enable data transmission on D+ and D-. Drive OE
high to disable data transmission or to receive data.
6
B2
SUSP
Input
Suspend Input. Drive SUSP low for normal operation. Drive SUSP high for low-power
state. In low-power state, RCV is low and VPI/VMI are active.
7
A1
VPI
Output Logic-Level Data Output. VPI is the level-translated value of D+.
8
A2
VMI
Output Logic-Level Data Output. VMI is the level-translated value of D-.
9
B3
ENUM
Input
Enumerate. Drive ENUM high to connect the internal 1.5kΩ resistor from D+ to 3.3V.
Drive ENUM low to disconnect the internal 1.5kΩ resistor.
10
A3
V_CC
Power
USB-Side Power-Supply Input. Connect V_CC to the incoming USB power supply.
Bypass V_CC to GND with a 1µF ceramic capacitor.
11
A4
GND
Power Ground
12
B4
D-
Input/
Output
Negative USB Differential Data Input/Output. Connect to the USB’s D- signal through
a 23.7Ω ±1% resistor.
13
C4
D+
Input/
Output
Positive USB Differential Data Input/Output. Connect to the USB’s D+ signal through
a 23.7Ω ±1% resistor.
14
D4
VTRM
Power ^{Regulated Output Voltage. VTRM provides a 3.3V output derived from VCC. Bypass}
VTRM to GND with a 1µF (min) low-ESR capacitor, such as ceramic or plastic film types.
15
D3
V_L
Power
System-Side Power-Supply Input. Connect to the system’s logic-level power supply,
1.65V to 3.6V.
USB Detector Output. A high at USB_DET signals to the ASIC that V_CC is present. A
16
C3
USB_DET
Output
low at USB_DET indicates that V_CC is not present. The MAX3344E USB_DET
threshold is between 3.6V (min) and 4V (max), while the MAX3345E USB_DET
threshold is between 1V (min) and 2.8V (max).
Detailed Description
The MAX3344E/MAX3345E are bidirectional transceivers
that convert single-ended or differential logic-level signals
to differential USB signals, and convert differential USB
signals to single-ended or differential logic-level signals.
The MAX3344E/MAX3345E are operational from V_CC =
5.5V to V_CC = 3V (electrical specifications are not guaran-
teed for V_CC < 4V). Both devices include an internal
1.5kΩ pullup resistor that connects and disconnects D+
to VTRM (see the Functional Diagram).
The MAX3344E/MAX3345E are tolerant to power seq-
uencing with either V_CC > V_L or V_L > V_CC. Additionally,
the USB I/O, D+ and D-, and V_CC are ESD protected to
±15kV. The MAX3344E/MAX3345E can receive USB
power (V_CC) directly from the USB connection and
operate with logic supplies (V_L) down to 1.65V, while
still meeting the USB physical layer specifications. The
MAX3344E/MAX3345E support full-speed (12Mbps)
USB specification 2.0 operation.
The MAX3344E/MAX3345E have an enumerate feature
that functions when power is applied. Driving ENUM low
disconnects the internal 1.5kΩ pullup resistor from D+
enumerating the USB. This is useful if changes in commu-
nication protocol are required while power is applied, and
while the USB cable is connected.
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