BCM43236 datasheet(23/43 Pages) CYPRESS

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Signal and Pin Descriptions

BROADCOM

September 16, 2013 • 43236_43236B-DS103-R

Page 22

BCM43236/BCM43236B Preliminary Data Sheet

Section 4: Signal and Pin Descriptions

Package Signal Descriptions

The signal name, type, and description of each pin in the BCM43236/BCM43236B 88-pin QFN package is listed

in Table 3. The symbols shown under Type indicate pin directions (I/O = bidirectional, I = input, O = output) and

the internal pull-up/pull-down characteristics (PU = weak internal pull-up resistor and PD = weak internal pull-

down resistor), if any. See also Table 4 on page 26 for resistor strapping options.

Table 3: Signal Descriptions

Signal

BCM43236/

BCM43236B Type

Description

Crystal Oscillator

xtal_in

XTAL oscillator input. Connect a 20 MHz, 10 ppm

crystal between the xtal_in and xtal_out pins.

xtal_out

XTAL oscillator output

xtal_buf_out

Buffered XTAL output

Serial Flash Interface

sflash_cs_l

O (8 mA-PU)

Serial flash chip select

sflash_q

I (8 mA-PU)

Serial flash data input

sflash_c

O (8 mA-PD)

Serial flash clock

sflash_d

O (8 mA)

Serial flash data output

USB Interface

usb_dmns

I/O

USB interface port D–

usb_dpls

I/O

USB interface port D+

usb_rref

During USB mode, tie this pin in parallel through

a 100 pF capacitor and a 4 kΩ resistor to ground.

During HSIC mode, tie this pin to a 50Ω resistor

to ground.

hsic_strb

USB HSIC strobe

hsic_data

I/O

USB HSIC data

usb_moncdr

–

For test/diagnostic purposes only.

Miscellaneous Signals

rcal_res_ext_core

Reference output, connect to ground via 15k 1%

resistor.

ext_por

External power-on reset (POR) input. Active low.

Allows an optional external power-on reset

circuit to be connected. If installed, the external

POR will override the internal POR.

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