Philips Semiconductors
ISP1105/1106/1107
Advanced USB transceivers
Product data
Rev. 07 — 29 March 2002
8 of 25
9397 750 09529
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
low-power (suspended) state level. Both the VP and VM pins are driven HIGH to
indicate this mode. Pin RCV is made LOW. Some hysteresis is built into the detection
of Vreg(3.3) lost.
[1]
High impedance or driven LOW.
[2]
ISP1105 only.
[1]
High impedance or driven LOW.
7.4 Power supply input options
The ISP1105/1106/1107 range has two power supply input options:
Internal regulator — VCC(5.0) is connected to 4.0 to 5.5 V. The internal regulator is
used to supply the internal circuitry with 3.3 V (nominal). The Vreg(3.3) pin becomes a
3.3 V output reference.
Regulator bypass — VCC(5.0) and Vreg(3.3) are connected to the same supply. The
internal regulator is bypassed and the internal circuitry is supplied directly from the
Vreg(3.3) power supply. The voltage range is 3.0 to 3.6 V to comply with the USB
specication.
The supply voltage range for each input option is specied in
Table 10.
Table 8:
Pin states in Disable or Sharing mode
Pins
Disable mode state
Sharing mode state
VCC(5.0)/Vreg(3.3)
5 V input / 3.3 V output
3.3 V input / 3.3 V input
not present
VCC(I/O)
not present
1.65 V to 3.6 V input
Vpu(3.3)
high impedance (off)
(D
+, D)
high impedance
(VP, VM)
H
RCV
L
Inputs (VO/VPO, FSE0/VMO,
SOFTCON)
high impedance
Table 9:
Power supply conguration overview
VCC(5.0) or
Vreg(3.3)
VCC(I/O)
Conguration
Special characteristics
connected
Normal mode
-
connected
not connected
Disable mode
(D
+, D) and V
pu(3.3) high
impedance; VP, VM, RCV:
not connected
connected
Sharing mode
(D
+, D) and Vpu(3.3) high
impedance;
VP, VM driven HIGH;
RCV driven LOW