ISP1107 datasheet(5/19 Pages) PHILIPS

5 / 19 page

Philips Semiconductors

ISP1107

Advanced USB transceiver

Objective speciﬁcation

Rev. 01 — 23 February 2000

5 of 19

9397 750 06899

7.2 Operating functions

[1]

RCV* denotes the signal level on output RCV just before SE0 state occurs. This level is kept stable

during the SE0 period.

7.3 Power supply conﬁgurations

The ISP1107 can be used with different power supply conﬁgurations, which can be

changed dynamically. An overview is given in Table 6.

Normal mode — Both VCC(I/O) and VCC(5.0)/Vreg(3.3) are connected. For 5 V

operation, VCC(5.0) is connected to a 5 V source (4.0 to 5.5 V). The internal voltage

regulator then produces 3.3 V for the USB connections. For 3.3 V operation, both

VCC(5.0) and Vreg(3.3) are connected to a 3.3 V source (3.0 - 3.6 V). VCC(I/O) is

independently connected to a 1.8 V, 2.5 V or 3.3 V source, depending on the supply

voltage of the external circuit.

Disable mode — VCC(I/O) is not connected, VCC(5.0)/Vreg(3.3) are connected. In this

mode, the ISP1107’s internal circuits ensure that the D+/D

− pins are in three-state

and the power consumption drops to the low-power (suspended) state level.

Sharing mode — VCC(I/O) is connected, VCC(5.0)/Vreg(3.3) are not connected. In this

mode, the D+/D

− pins are made three-state and the ISP1107 allows external signals

of up to 3.6 V to share the D+/D

− lines. The ISP1107’s internal circuits ensure that

virtually no current is drawn via the D+/D

− lines. The power consumption through pin

VCC(I/O) drops to the low-power (suspended) state level. Both the VP and VM pins are

driven HIGH to indicate this mode.

Table 4:

Driving function (OE = L)

FSE0

Data

differential logic 0

differential logic 1

SE0

Table 5:

Receiving function (OE=H)

+/D−

RCV

differential logic 0

differential logic 1

SE0

RCV* [1]

Table 6:

Power supply conﬁguration overview

VCC(5.0)/Vreg(3.3)

VCC(I/O)

Conﬁguration

Special characteristics

connected

Normal mode

connected

not connected

Disable mode

+/D− high impedance

not connected

connected

Sharing mode

+/D− are high impedance;

VP/VM are driven HIGH

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