Sony Ericsson GM47, GM48 manual Table below shows the switching times

2. SYSTEM CONNECTOR INTERFACE

RTS and CTS are capable of transmitting at 1/10th of the data transmission speed for data rates up to 460kbit/s (byte-oriented flow control mechanism).

Note! When hardware flow control is not used in communications between the application and the module, RTS and CTS must to be connected to each other at the module.

Switching times for RTS and CTS

The table below shows the switching times.

Parameter	Limit
Time from Low to High level	<2µs
Time from High to Low level	<2µs

Request to Send (RTS)

Used to condition the DCE for data transmission. The default level is high by internal pull up.

The application must pull RTS low to enable data transmission from the module. Similarly, the module asserts CTS low, indicating it is ready to receive data transmission from the host.

Parameter	Limit
Application driving impedance	<100Ω
Input capacitance	<2nF
Input resistance (pull-up)	100kΩ to VCC

Clear To Send (CTS)

CTS is asserted by the DCE to indicate that the host (DTE) may transmit data. When CTS is high, the host (DTE) is not permitted to transmit data.

The table below shows the load characteristics for this signal.

Parameter	Limit
Application load capacitance	<500pF
Application load resistance	≥1MΩ

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LZT 123 7263 R1C