VSC7440 datasheet(416/444 Pages) MICROSEMI

416 / 444 page

Electrical Specifications

VMDS-10492 VSC7440 Datasheet Revision 4.2

399

6.2.16

IEEE 1588 Time Tick Outputs

This section provides the AC specifications for the IEEE 1588 time tick output signals PTP_[3:0]. The

PTP signals are GPIO alternate functions. For more information, see GPIO Overlaid Functions,

page 352.

6.3

Current and Power Consumption

This section provides the current and power consumption requirements for the VSC7440 device.

6.3.1

Current Consumption

The following tables show the operating current for the device. Typical current consumption values are

over a full traffic load, nominal process and supply voltages, and at 25 °C case temperature. Maximum

current consumption values are over full traffic load and worst-case process, temperature, and supply

settings.

The following table shows current consumption values for the device.

Table 318 •

IEEE1588 Time Tick Output AC Specifications

Parameter

Symbol Minimum

Maximum

Unit Condition

PTP[3:0] frequency1

Frequency is programmable.

ƒ25

MHz

Clock duty cycle2

Both high and low clock periods are configured to the identical value using DEVCPU_PTP::PIN_WF_HIGH_PERIOD and

DEVCPU_PTP::PIN_WF_LOW_PERIOD.

Measured at 50% threshold.

PTP[3:0] rise time and fall time

tR, tF

20% to 80% threshold.

PTP[3:0] peak-to-peak jitter, bandwidth

between 12 kHz and 10 MHz3

Timing corrections performed by register writes and high/low periods that do not match a fixed number of 156.25 MHz clock cycles

will create jitter up to 3.5 ns.

200

PTP[3:0] peak-to-peak jitter, bandwidth

between 10 MHz and 80 MHz3

200

Table 319 •

Operating Current

Parameter

Symbol

Typical

Maximum

(TJ_MAX = 110 °C)

Maximum

(TJ_MAX = 125 °C) Unit

VDD operating current, 1.0 V

IDD

1.4

2.5

3.3

VDD_A operating current, 1.0 V

IDD_A

1.3

1.6

VDD_HS operating current, 1.0 V or 1.2 V

IDD_HS

0.24

0.25

VDD_VS operating current, 1.0 V or 1.2 V

IDD_VS

0.15

VDD_AL operating current, 1.0 V

IDD_AL

0.04

0.06

VDD_AH operating current, 2.5 V

IDD_AH

0.25

VDD_IODDR operating current1, 1.35 V or 1.5 V

DDR3 on-die termination is disabled.

IDD_IODDR 0.08

0.18

VDD_IO operating current2, 2.5 V

Unloaded pins.

IDD_IO

0.05

0.065

VSC7440 Datasheet(PDF) 416 Page - Microsemi Corporation

VSC7440 Datasheet(HTML) 416 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL